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They called him America’s golden son.

Now he’s the man who’d burn the world for a prince.


When Prince Theodore Rinaldi vanishes, Shepard “Shep” Winchester III will do anything to bring him back.

What starts as a mission of duty ignites into a forbidden obsession—one that blurs every line between loyalty and love.

Back in New York, the Kings are under attack, their secrets exposed, their brotherhood fractured.

And when an attempt on Theo’s life plays out in front of flashing cameras, the world sees what they were never meant to: a touch too intimate, a look too raw.

Shep is the son of American power.

Theo is European royalty.

And in a world built on loyalty, betrayal, and lies, love might be the most ruthless act of all.

280 pages, Kindle Edition

First published January 8, 2026

126 people are currently reading
703 people want to read

About the author

Brooke Blaine

60 books2,487 followers
Brooke Blaine is a USA Today Bestselling Author best known for writing romantic comedy and M/M romance. Her novels lead with humor and heart, but Brooke never shies away from throwing in something extra naughty that will scandalize her conservative Southern family for life (bless their hearts).

She’s a choc-o-holic, lives for eighties bands (which means she thinks guyliner is totally underrated), believes it’s always wine o’clock, and lives with the coolest cat on the planet—her Ragdoll/Maine Coon mix, Jackson Agador Spartacus.

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Displaying 1 - 30 of 169 reviews
Profile Image for Julia (bookish.jka).
975 reviews320 followers
Review of advance copy received from Author
January 13, 2026
"Jesus Christ, it was a sad day when I was getting handed my ass by James fucking Easton."

Ruthless is book 5 in the Park Avenue Kings series by powerhouse writing duo Brooke Blaine and Ella Frank and I absolutely LOVED it - especially all the cameos from some of our favourites!

It's set in the same world as the Park Avenue Princes series by the same authors, and whilst there's a definite link between the two worlds, pre-reading is not required (although I'd definitely recommend that series too!)

This is the second part of Shep and Theo's story and it had the perfect ending for these two Kings! Do make sure you read part 1 Merciless first!

What To Expect:

🖤MM darkish romance
🖤Colleagues/friends to lovers
🖤2 x alpha males
🖤Forced proximity
🖤Monaco royalty x American royalty
🖤Steamy AF times
🖤Opposites attract
🖤Found family
🖤HEA

Can't wait for Alessio and Father Vitale's book, the final one in the series, coming soon in Unholy ✝️

4.25 stars
Profile Image for Cadiva.
4,074 reviews456 followers
Review of advance copy received from Indie Reviewers
December 27, 2025
Good lawd this book.

I wasn't sure where it was going to go after the events of Merciless but I should have known it would be utterly crazy and filled with powerful men doing dodgy things in the name of love!

Here Shep's mantle as the controlled Park Avenue King drops and he's feral as he tries to find Theo and work out who's behind the plot which is threatening Libertine.

There's also a whole bunch of unresolved tension with King himself over the whole leading the bad guys to us in the jungle thang and I was very pleased to see that addressed and in a satisfying fashion that felt real to the background of all these characters.

No spoilers for the rest, but it did stray a little bit into run with it for the plot's sake rather than anything approaching how it would go in the actual world, but I'm more than happy to just let it go for pure entertainment value.

Soooooo, now we're just left with Unholy, Alesso's story and I am desperate now to find out how Brooke and Ella are going to deal with the sparks flying between him and Father Viale and how they'll resolve that in a way which feels genuine.

Suspend disbelief, jump in for the ride and fall in love with two powerful men going soft for each other while being willing to burn the world to the ground.

#ARC kindly received from the authors via The Author Agency, I am voluntarily leaving a review
Profile Image for haletostilinski.
1,559 reviews691 followers
January 14, 2026
⭐️ 4.5 stars rounded up! ⭐️

Shep and Theo continue their romance in this second installment, after the last left off with Theo being kidnapped right under Shep's nose.

I'd say the first 2/3's of this was excellent, 5 stars as we got even more development of these two and their relationship, and the plot advanced and kept us readers on the edge of our seat.

Once around the 60% mark came around, for the last third or so of this book, I'd say it slowed down a bit for me. I'd say that last part was around 4 stars for me, so that evens out to 4.5 stars. It was still good, I still loved these two together, but it was a lot story for just the wrap up of their story.

We get the main plot of these books wrapped by around 60% in, and it happens so quickly after all the build up and then we spend the last part of the book getting wrap up story, basically. Which was great, it was fine, but perhaps it didn't need to be almost 40% of the book, is all I'm saying.

Like yes, I loved that we got these two being able to be out with their relationship to the world, and get really settled into their relationship and all that, and then get to their HEA - that was all great, but it was still perhaps a bit too slow for me at times.

I don't think we needed that much time dedicated to all that.

Also, there is something a bit rushed that I don't know if I 100% agreed with -

I also feel like this skipped out on a few bits I'd have liked more detail on. Like .

I also felt that for a guy so smart, how the villain is captured was a bit...stupid. He has been stalking and building up to his ultimate plan for these guys for 6 years or so and he has the bright idea to go about it like that? And he gets taken down so easily? I just feel it should have been more of a challenge to capture and put an end to him, especially after he'd been so difficult to pin down and deal with before.

It felt a bit like the authors didn't know how else to bring him down, but, there could have been 40% more book space to use to make it more of a challenge. Like I don't know, even a big fight between the guy and his henchmen would have been great and felt earn, imo. Like Shep gets shot on the arm, but that's all anyone gets injured. For such a big threat, it didn't turn out to big such a big threat in the end at all.

So yeah, those are my main reasons for .5 off, I just think more could have been done to truly warp this story up the right way.

Theo and Shep were still a strong couple and I loved them together until the end, but yet, I had a few issues her and there, is all.

But still, this was a strong book, a strong couple, and for most of it, a strong story. It just fumbled a bit near the end.

Overall, I still highly recommend this and I loved Shep and Theo's story. I absolutely can't wait for Alessio and Father Vitale's story either, and to find out what's gone on between them in the past. Also I wouldn't mind some illicit sex between them even though it's oh so wrong for a Priest to break his celibacy...

So, until then! 😘

My Ratings for the Park Avenue Kings Series:

Savage: 5 stars (my review)
Devilish: 4.25 stars (my review)
Immoral: 4 stars (my review)
Merciless: 4.5 stars (my review)
✨ Ruthless: 4.5 stars
Profile Image for Sofi.
250 reviews1 follower
April 6, 2026
“I didn’t kneel for kings—but I would for him.”

I. LOVE THEM! These two are definitely my favorite characters and couple in the whole series, and this book was sooo good. The plot I was missing in the first half of Shep and Theo’s story was definitely here, and it was just the best combination of action, drama, emotions, tenderness, and of course, hot spice.

This book started strong, and from the first chapters I couldn’t put it down. It reminded me why I love this “group of rich and influential men being all vigilantes in the dark” world these two authors have created. So yeahh, I loved the plot, and the storyline had me hooked.

“You were trying to get back to me?”
“With every single breath I took.”


“I’d never felt such a soul-deep connection with someone. Not like this. Somewhere during this crazy whirlwind, Shep had gone from my what if? to my I’d die for you

Now I just have to talk about how much I love and how obsessed I am with both Theo and Shep. Everything about their dynamic, how their relationship developed, and their individual personalities has me crazy for them. I mean, they were perfect for each other, and I love how natural everything between them feels and how beautiful their intimacy grew to be.

“I had no idea that the person that would finally complete me was standing right next to me all along. He just wasn’t in focus yet.” I reached up to run my fingers down his stubbled cheek. “But you are now. You are all that’s bright, all that’s light in my life. You step into a room and every other person disappears out of it.”

“Theo slipped his hand over my heart and purred. “Mine.” I definitely was. My heart, my mind, and my soul—it all belonged to him now.”

In this book, we see them fully together without pretense or extra drama between them, since most of the conflict comes from outside their relationship, and I appreciate that so much. I loved the protectiveness and support they have for each other, and their playfulness was honestly so funny and adorable, I mean, the food fight… HA! Their dynamic felt so solid and genuine. I might be dramatic about them, but I just really love them.

“Non-negotiables of Theo and Shep. No traveling without the other (if longer than one night). No clothes allowed at the Rinaldi residence. No life-or-death secrets. One food fight a month to blow off steam (food of choice to alternate).” Shep paused then and licked over his lower lip, and I swallowed, knowing the last one was barely legible. “Never stop loving the other.”

I love that we got two books about them because their story felt more complete than all the others.

“There was nothing I wanted more than to wake up to his handsome face day after day, year after year, and if being apart for a few days had told me anything, it was that. He’d never have to search for me, because I’d always be there. That was a promise I could make, and so easily I wondered how it had taken me so long to see it”

Another incredible book in this series, and I am sooo sad I only have one more left. But I am excited to get to know Alessio more deeply, and we all know who the other MMC will be, and I am so intrigued to see how that will happen and the history they obviously have together.

-------------------

Quotes worth mentioning:


“Be obsessed with me, Shep. Because I sure as fuck can’t get enough of you.” 

“Open your eyes. I want to see you,”
I said, looking down at his gorgeous face. “I want you to see me.”
Theo’s legs tightened around me as he craned up to say against my mouth, “Eyes shut or eyes open, you’re all I see. All I want. Just you…”
Profile Image for Seraphina Reads.
591 reviews34 followers
Review of advance copy received from Author
January 8, 2026
Ruthless Book Review
Ella Frank & Brooke Blaine

Shep & Theo

👑 Billionaire
❤️ Alpha Heroes
👑 Royalty
❤️ Friends to Lovers
👑 Workplace Romance
❤️ Secret Romance
👑 Anti-Heroes


💫 Stars 🥺❤️

Ugh, my heart, I needed this book so badly. The way Merciless left off killed me.

EEK! I was sweating the first few pages, on the edge of my seat!

Shep was fittin’ to blow, he needed his man back!

This was perfection!

The way King got taken down a notch or two, was the best ever! Didn’t reali3ze how I needed that lol He was getting on my last nerve, the audacity to be bothered by Shep & Theo, my eyes rolled out of my head lol Absolutely not!

Ugh this was beautiful, sweet, funny, romantic, just literally perfect.

They are so perfect for each other. They match each other's energies so well. They know exactly how to deal with each other's fits lol No one else could have handled Theo and his food throwing lol.

Ugh, I loved this so much. Pretty sure I didn't breathe this whole book lol Read it in one sitting like it was giving me life!

The Vegas trip had me sobbing, this book made my heart so happy. I needed their HEA so badly. It was a perfect HEA too, over the top, but they needed it, after everything, especially Shep.

No more hiding! Ugh, I’m teary-eyed. I loved this so, so much.

Uhm Alessio and The Father, I’m gagged, I can’t wait, eeek!

All the stars
All the hearts
Just yes, Yes, Yes, I so needed this book.

So thankful for this arc
Profile Image for melissa.
159 reviews18 followers
April 1, 2026
3.75⭐️
“I’m not your keeper, I’m your man.
And you’re my priority over everyone.”


You know what? Ch15 made me give this one more star because i I LOVED and I was laughing my ass off watching Theo drag East and King ass, Even Zac caught strays too lmao

“Is King home?”
“Yeah, we’re all here.”
“Great, that’s just what we fucking need. King’s harem.”
“Theo.”

“What’s so important it has you two interrupting brunch?”
“None of your fucking business, go run and tell your nanny he’s got visitors.” 

“You two don’t mind entertaining Shep while King and I chat, do you? Maybe you can show him your new toy collection?”


He really had balls of steel because to disrespect East in one of his boyfriends house who happens to be your leader had my jaw on the floor and I HAVE to say this: JAMES EASTON IS OVERRATED

it was a sad day when I was getting handed my ass by James fucking Easton.

Bro SHUT UP, grow a freaking backbone and STAND YOUR GROUND because u weren't doing ANYTHING wrong. If anything, the one who had been acting badly here with you and Theo was King useless ass doubting Theo and questioning whether he trusts his brothers or hides things, when the only one hiding things was HIM, so you had no reason to sit there listening to East speech about King missing u and all blah blah blah, those are the consequences of his actions, so enough

“You wanna talk about Shep, let’s talk about Shep. How about we start with the fact that I’m better for him than you could ever be? I’d never hide someone so fucking amazing, and I’d sure as hell never throw him away like you did. He deserves better, and you know what? I am.” 

Yes babe, you were, anyway good book, just nothing extraordinary overall. I liked Theo and Shep, like Theo more than Shep tbh and liked them as a couple.
Profile Image for Zach.
622 reviews28 followers
January 14, 2026
4.5/5 - I love Theo and Shep so much! This was a great follow-up to Merciless. I really loved the over all storyline and ending. I will say at times the conflict got resolved fairly quickly. However, I still have fun with it and the spice scenes were top notched.
Profile Image for Bookloversofantastic.
608 reviews19 followers
January 7, 2026
4,75⭐️
This book was exactly how I wanted it to be, I deeply love the dynamic between Theo and Shep and seeing them fighting for each other is everything. How they learn to trust the other, believe that they would not betray each other and would do anything for each other. So many things happen between the Kings themselves and it is possible to really see where alliances are, how the brotherhood is working and seeing been the different masks.

I do not want this series to end, I really enjoyed the fact that there is more action and sensation, it was thrilling.

Theo and Shep are my fav couple and they deserved to have two books for this intense relationship.

I received an ARC Copy of this book, this review is from my own thoughts 😍
Profile Image for Sammy!.
190 reviews8 followers
March 22, 2026
I have absolutely loved this series and was so excited for this book, especially after that cliffhanger in Merciless and it 100% delivers! The story picks up right where the last book left off and I was immediately right back into it!

I loved that this story gets right into with intense action and then once Shep and Theo are back together it softens a bit and the focus really is on these two moving forward and building a relationship together. Of course it has the Park Avenue Kings drama and antics still, especially as they discover who is behind what all has happened with Theo but that focus really is on these two together. We also get to see King a little differently and really kind of close the loop with his former relationship with Shep. I really loved how that came together and the resolution there.

I absolutely adore Shep and Theo together, they are hot, sweet, a little crazy and totally in love and it was just so much fun to go on that journey. Again, I love this series so much and SO looking forward to the next book – feel like we’ve been waiting for that story throughout this fantastic journey!
Profile Image for Wicked River Reads.
338 reviews12 followers
December 24, 2025
I have been waiting for this ever since the end of book 4 and I was not disappointed!!! I love Theo and Shep so much and the shift in their relationship was fantastic to see. Theo is such a chaos gremlin who cares about the kings and Shep so fiercely and Shep is the logical calm Theo needs and together they balance each other. The food fight, napkin declaration and banter were a great time! I really liked the way they dealt with King and the changes in the group dynamic. The side characters are always fun and I’m excited for 6!


💛ARC REVIEW💜
184 reviews
Review of advance copy received from Author
January 3, 2026
After the cliffhanger from the last book, I was desperate to get stuck into this one, so I was eagerly downloading this ARC as soon as I saw it in my inbox.

I was absolutely ready for Shep to unleash hell to find his man. The protective side of Shep is my absolute favourite - his determination and fight not to give up on Theo *massive swoon*
 
These two have firmly won the place of my favourite couple from this series so far (sorry, Lucien and Kai. You two are a very close second!). Their back and forths are absolute gold, and their chemistry *phew* absolutely smoking! I’m surprised they don’t set everything on fire around them, they are so hot together.
 
I can’t get enough of Theo’s sarcastic comebacks and seeing Shep behind closed doors when he lets his hair down.
 
I adore how these two’s personalities balance each other out so perfectly, and that they bring out the best in each other. While perhaps Shep’s positive influence on our wild card Theo is more obvious, the former is encouraged to stand up for himself and his man, which I appreciated very much. I was mentally cheering Shep on when he finally lets loose on King after being a ‘good’ second in command for so long, despite all the past hurt.
 
These two each needed someone to support them, to believe and trust in them. They’re used to being in the spotlight, but they find love behind closed doors in the most unexpected place. I so loved watching them fall for each other. Two men who didn’t want anything serious but can’t help their feelings. They are so much stronger together.
 
It's an intense ride for Theo and Shep, but I was very happy with the ending. It felt so right, and I was thrilled that they got to honour their relationship on their terms.
 
It feels like the Kings were tested during this duet, but ultimately their family of brothers come out all the stronger following this trial. I’m so excited for Alessio’s story.


------

Some of my favourite quotes
 
“You were trying to get back to me?” “With every single breath I took.”

“You have nothing to be sorry about. You came for me, you found me, you saved me.”

But you always did say I was a royal nightmare.” “Maybe so... But I’m starting to think you’re my royal dream.”

“When it comes to you and me, I’m not hiding anymore. Not from anyone.”

“Be obsessed with me, Shep. Because I sure as fuck can’t get enough of you.”

“I’m not your keeper, Theo. I’m your man. And you’re my priority over everyone.”

“I had no idea that the person that would finally complete me was standing right next to me all along. He just wasn’t in focus yet. But you are now. You are all that’s bright, all that’s light in my life.”

“I knew I’d be your menace.”

----

Thank you to the authors and The Author Agency for the ARC copy of this book. This is my honest review.
Profile Image for Gül Türkay.
61 reviews6 followers
Review of advance copy received from Author
January 6, 2026
Ruthless – Ella Frank & Brooke Blaine
ARC REVİEW 📖💫

Ruthless was one of those books that pushed me out of my comfort zone, yet somehow I couldn’t put it down.

The story isn’t soft, and neither are the characters. Honestly, that’s exactly the point of this book.

Are the relationships toxic? Yes.
Are there bad decisions? Absolutely.
But within all that chaos, there’s a pull that makes it hard to say “no.”
The characters are self-aware;
they know they’re not good people, and they have no intention of stopping.

Power struggles, control, and uncontrollable desires make the story grow darker and darker, and despite everything, you keep reading.

More than once while reading, I caught myself thinking:

“I’m not defending this, but I’m curious.”

If you enjoy dark romance,

flawed characters, relationships where boundaries are deliberately pushed, and disturbing emotional dynamics, Ruthless is that book.

It’s not for everyone, but for those who love it, it’s highly addictive. 🖤
Profile Image for Lila‘s 1000Lifes.
92 reviews5 followers
January 8, 2026
3.5 stars rounded up.

Ruthless is the fifth book in the Park Avenue Kings series and the second book in Shep‘s and Theo‘s Storyline.

This story began where Merciless (the fourth book) ended and for the first half of this book, I was on the edge of my seat! Shep in „I burn the world down for Theo“ mode was so hot! Theo finally confronting King? Yes, yes, yes! Shep and Theo building their relationship? I was here for it!
The only thing that was a bit confusing was the second part of the book. It felt anticlimactic… All the action was gone, everything settled and for my liking, everything was a bit too lovey-dovey after that. To me, it felt like a really prolonged epilogue and I‘m not sure if it fit the characters (at least it wasn‘t what I expected).

But overall, I loved Theo‘s and Shep‘s story and can‘t wait for the next book in the series.

Thank you to the authors and The Author Agency for sending me an ARC. All opinions are my own.
Profile Image for yaishin.
914 reviews119 followers
April 23, 2026
i loved shep and theo ofc but they did not need 2 books.
Profile Image for Sonja ☾.
294 reviews10 followers
February 19, 2026
M/M || Part 2 of 2 || President’s Son X Prince of Monaco || Kidnapping || Established Relationship || Secret Organization || Suspense || Hurt/Comfort || Getting Married || Fluff

4.5⭐️
3🌶️

“It was Theo. It always had been. My forever had been right in front of me all this time—l'd just been looking in the wrong direction“.

ㅤ ‍‍‍‍‍‍ ‍‍‍‍‍‍ ‍‍‍‍‍‍ ‍‍‍‍‍‍ ‍‍‍‍‍‍ -ˋˏ ೃ༄ 𝒔𝒚𝒏𝒐𝒑𝒔𝒊𝒔 ೃ༄ ˎˊ-

Continues directly from the end of Merciless when Theo was taken from right under Shep’s and King’s noses.

ㅤ ‍‍‍‍‍‍ ‍‍‍‍‍‍ ‍‍‍‍‍‍ ‍‍‍‍‍‍ ‍‍‍‍‍‍ -ˋˏ ೃ༄ 𝒎𝒚 𝒕𝒉𝒐𝒖𝒈𝒉𝒕𝒔 ೃ༄ ˎˊ-

‼️ Part 5 of Park Avenue Kings + Part 2 of a duet ‼️

“You were trying to get back to me?”

“With every single breath I took.”


I wanted the kidnap arc to last longer☹️ The reunion would’ve been so much sweeter that way.

I can’t lie but the reveal was a little bit unsatisfying. I won’t say who the bad guy is here but just know that the lead up to it was big and the reveal a bit bland.

The first book was better than this one if we’re looking at the two as two distinct books rather than one story arcing over two books. The first one had the mystery of the threats, the falling in love, the butting heads, just everything great. This entire book felt like it was all the final third act of a book. Especially when at like 60-70% in it started feeling like the fully epilogue where they’re just happy and things are okay. That said: it was still AMAZING to read. If I had a longer break between Merciless and this one I think I would’ve been a little disappointed, the first book is just that important here. So please make sure to read these two close together! I also LOVE epilogues where they’re happy and in love so I did not mind this book at all. (they get married here yippeeee)

I'd somehow managed to make Shepard O'Neil Winchester the third fall in love with me. Me. The most chaotic, reckless pain in the ass he knew. Guess he just needed a challenge.


The proposal in this book is one of the sweetest ones I’ve ever read🥺 It’s very lowkey and almost spur of the moment, but it is so good ❤️

“Non-negotiables of Theo and Shep. No traveling without the other (if longer than one night). No clothes allowed at the Rinaldi residence. No life-or-death secrets. One food fight a month to blow off steam (food of choice to alternate).” Shep paused then and licked over his lower lip, and I swallowed, knowing the last one was barely legible. “Never stop loving the other.”


Like come ooooooooon, they’re so in love💥💥

Theo walking down the aisle to I’m Gonna Be (500 Miles) by The Proclaimers is actually so funny😭 (And it also being their first dance later, a slower version of it, is so sweet) The vows are so cheesy and cute and perfect ahhhhhhh❤️

And Shep’s now Shepherd Rinaldi!!!

This was like a royal fairytale, one I'd never imagined I would be a part of or even dreamed of wanting. I'd just happened to fall in love with a prince and made him my husband.


I feel like I just smiled goofily like the last 40% of the book and I did not mind at all, I loved it😝

Theo and Shep’s story is the biggest one so far due to the length and how it was slowed down since it’s twice as long as the other couples, we really had time to see them fall in love and come together (pun fully intended). All the books are on the shorter side so this having two books to tell their story really helped solidifying their relationship for me.

I mentioned in my Merciless review that Shep tops more, but in this book it’s Theo who tops more so at the end they’re pretty balanced when it comes to positions. However I can’t lie, I like Shep as a top more🙈

But yeah.🥹 If you hate epilogue and the happily ever after, I’m afraid you will hate this book. But the rest of you fluff enjoyers: this is pure gold🫶🏻 Please read Merciless and this one, you won’t regret it!

Ps. They finally revealed Shep’s age: he’s the big four-oh aka 40 years old🫡

🍒 Characters: 🍒

👔Shepherd “Shep” Winchester III -> Shepard Rinaldi: 40 years old, sandy-brown hair, ice-blue eyes, taller than Theo, stubble, sculpted jaw, full lips, handsome, muscles, former president’s son, big cock, vers (but bottoms more in this book)

👑Theodore “Theo” Rinaldi: 37 years old, thick dark hair, blue eyes, stubble, angular handsome face, youngest Prince of Monaco, vers (but tops more in this book)
Profile Image for Christina | readingthroughatlanta.
498 reviews76 followers
December 24, 2025
Great conclusion for these two.

I love them so much. Book 2 feels like a quieter, more
love/family oriented book than book 1 but it is no less fun and impactful. And spicy - can’t forget about that spice!

Appreciate the quiet moments as these two grew as a couple. Loved spending more time with the other Kings and seeing them address a few things that really
needed to be addressed for the betterment of
the group. And thank god that cliffhanger from book 1 was handled and not dragged out too long - these authors can do no wrong! I didn’t think they could top my love for the princes but this series continues to deliver over and over again.

what a whirlwind but I’m so ready (and sad) for the final book!

I received a complimentary copy in exchange for my
honest review.
Profile Image for Ziezie.
838 reviews28 followers
January 16, 2026
When Merciless first came out, i pounced on it because love this and the princes series but thank goodness i didn’t read past the first page because i found out it had a major cliffy. I’m one of those people who are not friends with cliffhangers 😂. So i waited and waited and finally Ruthless came out and only then i could read Merciless. Yay!!
Love love Shep and Theo. My fav couple in the Park Avenue Kings series so far. I can’t wait for Alesio’s story!!!
Profile Image for GM Katz.
Author 14 books59 followers
January 21, 2026
Such a great series!

I will continue to obsess over all these men of Park Avenue. From the Princes to the Kings, it is everything you want from a steamy and swoony, with angst and suspense. And even some humor. These were all most present with this duet that follows Theo and Seth story. Sooo good and sooo excited for Alessio and Vitale’s book!
Profile Image for Eliana Suáres .
49 reviews1 follower
Review of advance copy received from Author
December 22, 2025
*ARC*
Simplemente perfecto. Un final así de feliz se merecían Theo y Shep RINALDI !!! Los amé mucho.

No puedo creer que solo quede un libro para que termine esta serie 😭
Profile Image for Alexis.
853 reviews23 followers
January 26, 2026
this was fine lol I dont think shep and Theo needed two books tbh I kind of skimmed the entire second half tho so maybe I just wasn’t in the mood for this!
Profile Image for Jovi.
36 reviews18 followers
Review of advance copy received from Author
December 21, 2025
Arc received via authors Patreon.
147 reviews1 follower
April 22, 2026
Tropes & Themes

Friends to lovers
Opposites attract


What I loved / liked :

From their second book :

The fact that it took only 4 chapters for Shep to reunite with Theo because I hate separations, whatever reason the MC’s got separated.

Against the general and popular opinion, I loved that it was East who handed his ass to Shep. I’ve hated how the authors have made him so detestable in this series, and maybe, readers hated him even more after he spoke with Shep, but it made me love him more. He was the reasonable one for once, opened Shep’s eyes with a few truth, and he initiated the peace between them all.

From the first book:

Theo and Shep as characters. They really grew on me from serious Shep to fun Shep and from uncontrollable, selfish Theo to more down to earth Theo. They each brought out what the other was missing.

Considering the list of things I disliked in this book, it’s really that I loved these characters to put 4 stars to this book because the story in itself was meh… sometimes boring and slow.

What I hated / disliked :

The fact that everyone despises East. He sure is what he is, an arrogant little shit, and though it’s been quite a while since I read his book, I remember I really liked him with Zach and King. And I mostly hate that the authors made him so antagonistic toward everyone.

The entire unraveling was really bullshit…
No indication of timelapse, it feels like it’s the following day after they identified Ari but such a gala would take a while to organize..
While going to such a gala, wouldn’t each of them have their +1? Where are East, Zach, Kai and Dimitri?
This is a public event with paparazzi and media, but no one questions what is happening, they don’t even try to hide as they speak once Ari has been taken down, and greatest of all: like there’s no camera taking Ari being taken away before the police arrive??? How convenient is it that they captured the momentum between Theo and Shep but none of them captured how Alessio tackled Ari and how Ari was taken away?

Narrative in past tense. I hate those. And that’s just me as it seems like a large majority of readers prefer past tense.


Quick summary:

Shep and King try to look for Theo though King quickly gives up and returns to NYC. Shep, feeling deep inside of him that Theo is still here, goes on searching. Theo is actually near, held in a cave by a merc whom he hears talking to another by phone, mentioning that he’ll take Theo to « Mott ». Theo manages to free himself, runs away and fights with the guy. Just as the guy is about to shoot him, Shep arrives and kills the guy. They return to the safe house to treat his wounds, have sex, and fly back to NYC.

Two days later, they meet everyone at Libertine. They come out about their relationship, recount everything from the start, but King refuses to discuss how he messed up then. They mention the Mott thing and go back to Shep’s home where Theo falls asleep right away. Shep realizes his feelings for Theo. Shep works out with Alessio on Mott and the next morning, Alessio comes up with a storage unit on Mott Street in NY.

The following night they visit the storage facility and discover a place filled with intel on them as targets, and a video showing King killing a man who seemed to be the blackmailer’s younger brother. They take as much as they can on pictures and videos and tension arises as they understand that it all originated to King’s act, something he’d never anyone about and doesn’t even apologize for.

Theo is riled up as they get back home, taking it on Shep as he drinks. They argue, have a food fight and end up having sex in the shower.

Two days later, they go to King’s, Theo ready to have an explanation. Shep is left with East, who turns out to be the eye opener regarding the whole situation and tension. Everyone was selfish and didn’t think about the others, or about the group as a whole.

Theo also has that much needed conversation with King who eventually apologizes and confesses that he messed up by going to Brazil because he was distracted by unexpected feelings seeing Shep had eventually moved on. He does love Zach and East, he just wasn’t expecting how it would feel to see Shep with someone else. Just as they reconcile, Alessio calls to announce he has identified their enemy. He’s a Libertine member and they starts throwing ideas to lure him out without raising suspicion, at the same time arguing on using Theo as bait. The argument lasts a bit more when they get back home but it ends with sex.

They organize a gala through Archer a few days later where Ari directly shoots at Theo as they all arrive on the red carpet. He misses all his shots and gets taken down by Alessio. Though a bullet grazed Shep’s arm, they all go to Libertine with Ari except for Benoit and Lucien who stay for the gala. At Libertine they quickly interrogate Ari before killing him.

The following morning, not having slept, they have sex. They also learn that an article was published on their potential relationship. As they go out, there’s plenty of paparazzi outside and they decide to show their relationship. One week later they’re summoned to Shep’s family place where there’s also Theo’s parents, and they all approve of their relationship.

Then they’re summoned to Libertine for a dinner with everyone where they all apologize to Theo for doubting him. Lucien also announces plans for proposing to Kai. Alessio is still upset though, and leaves the room. Shep talks to him and convinces him to go for their monthly visit to Father Vitale.

A few days later, Theo is back from three days in Monaco, and on their reunion, he proposes to Shep who accepts and they fly to Vegas to get married. Two days after they’re back, they realize that Shep’s place is too small to fit all their stuff so they look at other places to buy together.

Four months later they have another wedding celebration in Monaco in public.

Characters of the series :

Tyrone Kingston: professor at Astor University (Park avenue Princes series) who’s with student / « Prince » James Easton and Zac Fletcher, teacher assistant.

Lachlan Stone: King member. Hitman at night. Head of Stone Security the day.
Cooper Patterson: journalist from Colorado who moved to NYC to investigate on his best friend’s death.

Alessio Trentacapelli: King member. IT genius. Technocrat. 32.
Rafael: or Father Vitale, a priest. Alessio’s ex. 32.

Benoît Olivier: King member. Former burlesque dancer. Charmer. French.
Dimitri Stavros: arms dealer. 47. Was raised by the man who accidentally killed his father. Killed Giorgos as he was plotting against him.

Theo Rinaldi : King member. Youngest prince of Monaco. Rebellious and unhinged. 37.
Shepherd Winchester: King’s second in command. King’s ex. Son of former POTUS. Levelheaded. 40.

Lucien Vale: King member. 37. Owner of The Veil, a sex club, and other establishments.
Kai: 23. Parents kicked him out at 15. Lived on the streets and prostituted, then was sold and traded between rich men.
This entire review has been hidden because of spoilers.
Profile Image for Swoony and Spicy.
148 reviews10 followers
January 15, 2026
4.5⭐️
3.5 🌶️

Tropes and Tags:
- 1st Person, Dual POV
- Low angst with action
- Secret Relationship
- Billionaires
- Friends to Lovers

This is the second book of a duet within the Park Avenue Kings series, and is Shep and Theo’s HEA! I was super excited for this book after the ending of Merciless and I really liked how their story was wrapped up.

These two are absolutely crazy for each other. Like completely FERAL to be around and protect one another. The obsession is very strong and I was sat for it!

I really enjoy the suspense and plot that this series has continued to deliver, it always has me absorbed and turning pages well into the night!

I’ve loved all of the couples in this series, they’re just so much fun. Alessio our “Unholy” King is up next, and I’m basically foaming at the mouth for that story!😩🙏🏽
Profile Image for Valeen Robertson (Live Thru Books Blog).
5,961 reviews212 followers
January 9, 2026




Amazon



Shep is going out of his mind trying to find Theo. King's here making things worse, but Shep is going to do whatever he can to find his man, even if that means making King leave. Once he finds him, he's gonna burn down the world to find who's targeting the man he's realized he's fallen for. When he finds them, he knows what has to be done...



It's unfortunate that it took something so drastic for Shep to finally realize how he felt for Theo, but whew, once he did, he never wavered. An American royal and a European prince sounds like a bad idea on paper, especially when they're as opposite as this pair, but they couldn't have made a more perfect couple, more delicious pair once they finally admitted their feelings. The Kings took a lot of hits this time around, and tension was sky high, but Shep and Theo finally coming together, and the ensuing fallout of that and the damage done to their group, actually brought them all together into an even tighter unit. My favorite King, Alessio, is getting his story next with Father Vitale, and I am so impatient for them now, even though it means the Kings series will be ending.



ARC provided by The Author Agency for an honest review.

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Profile Image for Nancy  Bennett.
89 reviews
Review of advance copy received from Autore
January 2, 2026
Small review: (LOVED IT!!! I can't wait to review better this book! I love you so much Brooke and Ella! Wow! Wow! Wow!)


ARC REVIEW
RUTHLESS (PARK AVENUE KINGS 5)
RELEASE: 8/1/2026
5⭐ 5🌶

This book is the best and sweetest of the whole series! I really loved Merciless but I was waiting for Ruthless because I needed answers after the end of Merciless. Brooke and Ella made an amazing job here, if I thought that Merciless was amazing and perfect yet, well… they decided to write a masterpiece in Ruthless! I can’t find the right words to express how much I loved this book, how perfect were Theo and Shepard and how amazing is their love story!
Since SAVAGE (PAK 1) I was waiting for Alessio’s book because I fell in love with him while reading the other books of the series, but reading Merciless I found out that Shepard O Neil Winchester III is an amazing character and I fell in love with him. I loved Theodore too, but in my opinion Shep is one of the best characters ever, best written by Ella and Brooke! He has everything I’d like in a man. I was surprised to fall in love so badly with him because I’m still waiting for Alessio!!! I’m sad because this amazing series is almost over, but I know for sure that Brooke and Ella won’t make us wait long for their new books! Can’t wait!
Thank you very much for the ARC COPY!

PS: Merciless and Ruthless is a duet book, so you must read them together, but first, you have to read the others books from Park Avenue Kings. (Small suggestion: start reading the Park Avenue Princes, especially book 6 because you can see a glimpse of Park Avenue Kings series!!)

-------
ARC REVIEW
RUTHLESS (PARK AVENUE KINGS 5)
RELEASE: 8/1/2026
5⭐ 5🌶

RECENSIONE:

Trovare le parole giuste per recensire questo libro e questa storia (comincia con Merciless) è difficile perché tutte le parole che potrei usare non renderebbero giustizia alla PERFEZIONE che è stata questa avventura.
Premetto dicendo che ADORO tutta la serie dei Kings (amore nato con il 6 e ultimo libro dei Park Avenue Princes).
Quando ho letto il primo libro di questa nuova serie, Savage, aspettavo solo la storia di Alessio Trentacapelli. Mi ha catturata da subito il suo personaggio e ho letto la serie amando tutti i Kings (dai quali vorrei farmi adottare).
C’è un segreto che riguarda un personaggio e leggere la serie è stato divertente perché volevo scoprire sempre di più. Poi è arrivato Merciless e… vi avevo detto che sto aspettando la storia di Alessio, no? Beh. Ho conosciuto meglio un altro King, Shepard O’Neil Winchester III e… mi sono innamorata di lui. È stato un amore improvviso, non pensavo mi catturasse in questo modo e soprattutto non credevo di innamorarmi perdutamente di lui.
È stato improvviso e non me lo aspettavo proprio perché ero già cotta di Alessio. E invece Brooke Blaine e Ella Frank sono riuscite a sviluppare un personaggio meraviglioso, è davvero il book boyfriend perfetto! Ha tutto quello che ho sempre desiderato in un uomo e vederlo con Theo Rinaldi, principe di Monaco, è stata un’avventura meravigliosa. I due formano una coppia perfetta, la dilogia (Merciless e Ruthless) è una delle storie meglio scritte, sviluppate e la coppia perfettamente bilanciata, perfetta sotto ogni aspetto!

Questa serie migliora ad ogni libro e ora non vedo l’ora di leggere il 6 (e purtroppo ultimo della serie) Unholy.
Il titolo è perfetto per la coppia protagonista 😏 e non vedo l’ora di leggerla.
Sono triste perché finirà questa serie (che ho adorato con tutto il mio cuore) ma so già che Ella e Brooke non mi lasceranno senza niente da leggere e… chissà, una nuova serie da zero? O una nuova serie che si collegherà ai Kings?
Ho altissime aspettative e so che Brooke e Ella non mi deluderanno! Vi amo! Grazie per la copia ARC. Alla prossima storia!
Nancy
Profile Image for MJLovestoRead.
2,308 reviews59 followers
January 15, 2026
Ruthless is exactly what I needed to complete the wild love affair between Shep and Theo. Ella Frank and Brooke Blaine upped their writing game (again!) with the intense conclusion to these two Libertine 'brothers's romance that starts with a race against time to find Theo and ends with a connection so strong, I wondered right along with our guys why it took them so long to really see the other. With the combination of wit, longing, passion that is out of this world wonderful and a love that consumes them both, I was a giddy fool (yes, once again) reading this gem.

What I really enjoyed was that these talented authors didn't waste time in reconnecting Shep with his man despite King's warnings and proved the bond they had was indestructible. It's almost as if both Theo and Shep were lost but when they finally saw the other as more than just a compadre, they were beautifully found. What Shep does to rescue his guy was fabulous and I don't mind saying that seeing King as a bit sheepish in his lack of confidence in both his former lover and in Theo added a realism that sets these authors' storytelling skills apart from so many others.

Frank and Blaine don't prey on these Libertine men's emotions but allow them to be vulnerable in the confines of their lair, with touching moments between them that counter all the brutality that comes with being in their world. The scene when they all decide to come clean with the doubts they may have had wrt Theo was wonderfully written and gave me a new appreciation for the bonds they have with each other. The way they all tease each other, yet are always filled with concern that each brother is well protected and has the life they want outside of their business, is truly a beautiful thing.

Plenty is still on the horizon for this crew as Frank and Blaine combine the intensifying love between Theo and Shep that includes a crazy time in Vegas with continued threats against their business and all and who they hold dear. Not to mention all that is plaguing Alessio, setting up what will undoubtedly be one heck of a great conclusion to this incredible series with his book, the last. We also get a few glimpses of the significant others of our guys, with East forever a standout and perhaps even a bit wise beyond his years, as some well-though-out words help bridge the gap between King and Theo. It's those little moments that make this series memorable.

Bittersweet that Unholy will be the final story for these Kings, I am just so thrilled I have been able to read the brilliant words of Ella Frank and Brooke Blaine. Ruthless had me laughing, tearing up and falling even harder for their Libertine men. They are all wicked in and out of the bedroom and their lives, albeit a bit unique, never fail to entertain.

5 huge stars!!
Profile Image for Crystal Stafford.
426 reviews6 followers
January 10, 2026
LOVED the continuation of Shep and Theo. They are wonderful together and set the pages on fire with their chemistry. The love they have for each other runs deep and wild and it is no wonder they needed two books! Ella and Brooke left us with one heck of a cliffhanger at the end of Theo's book, and it was so intense seeing them apart and seeing what they would both do to get back to each other again. There were ups and downs and conflicts to solve but it was done so smoothly. I wanted a tad bit more when it came to finding the villain who captured Theo, more on page action before we got back to the healing and love. This part read a little flat to me honestly; however, I loved the way the Kings came together as always and as far as KING goes, well he had me all mixed up for a bit but no need to fear you will still love the man...and his Tweetlesweet and Tweetlebrat.

The flow of the story was good, the beginning started with a bang, the middle was up and down, and the end was epically sweet. Shep and Theo have so much in common and yet are so different; two men who hold heavy responsibility on their shoulders, who are public figures, and know what they want and how to get it. Their lives have brought on challenges that they have risen above, and they have been spoiled at times with everything they could ever need. However, it is just recently that Shep has gotten the one thing he's always WANTED, someone who would love him openly. And now with the attempts on Theo's life and the threat of more to come even with Theo back in the safety of his arms, the difference between what was when they were just friends and fellow brothers to now being deeply in love, it is making Shep fiercely determined to end the person who took his Prince. And Theo has that same desire but also needs to keep Shep safe once they know the threat runs deeper than The Kings could have imagined.

Theo and Shep really took my breath away with their love declarations and how intune they were with each other. How things went from "platonic" to soulmate was amazing and I LIVED for the steamy yet sweet moments between these two. Shep is such a sucker for Theo and Theo is just as bad for Shep. Their love was fast, fierce, and flaming hot. They were RUTHLESS for one another.

If you like a bit of action and intensity, high heat MM romance, this would be the book for you! It cannot be read as a standalone, but don't fear, the Kings are worth starting at the beginning. NOW WE GET ALESSIO!!!!

I read and reviewed a complimentary copy og this book provided by the other as part of being a patreon.
Profile Image for Maxie.
95 reviews6 followers
Review of advance copy
January 4, 2026
ARC Review
*mild spoilers ahead*

Ruthless picks up right after the cliffhanger from Merciless, the fourth book in this series and the first one of the duet about Theo and Shep.

We jump right in with Theo having just disappeared, and Shep desperately searching for him.
So, you really need to have read Merciless before diving into this story, it’s pretty much essential if you want to understand what’s going on.

Now, you’d think that with the stakes being so high, it would take a while to sort out the initial drama, aka, the kidnapping, but nope, Shep rescues Theo pretty quickly. After that, it’s partly about hunting down who was behind it and partly about Shep and Theo figuring out this new version of their relationship.

I really enjoyed this book. Shep and Theo are my favorite couple in the whole series. Their chemistry is off the charts, and what’s really refreshing is that there’s no huge power imbalance between them like in the other books. They’re both just so interesting and charismatic, whether together or on their own. Their banter and connection make the story super engaging, and the spicy scenes are really hot.

That said, I kind of feel like the whole plot could’ve been wrapped up just as well in one book, so I don’t really get why it had to be stretched out. Was it just because they’re both “kings”? I’m not sure, but I think I would’ve enjoyed it more if it was all in one go. Book two didn’t really bring much new information, to be honest.

Still, this is a really fun read. Like I said, both Theo and Shep are extremely charismatic and interesting, and the side plot is engaging enough to keep you hooked.

If anything, this book made me dislike Ty King even more. He already rubbed me the wrong way in his own book in the Princes’ series (I really thought he was unnecessary, and that Zac and East would’ve been better off on their own.)

But here, he’s just unbearable. Not only do we find out that his ex (the one he brushed off) was Shep, but he’s still trying to hang onto him and have a say in his personal life, even while flaunting his younger boyfriends right in his face.

Plus, he’s the reason everyone’s in danger, and in the end, there aren’t any real consequences for him.

He really drags the series down, which is a bummer because it’s otherwise a really entertaining read.

I’m super curious about Alessio’s story, though. It’s been teased since book one, and it sounds interesting enough that I’m willing to put up with King for one more book.

Profile Image for Kay Daniels (Kay Daniels Romance).
2,233 reviews76 followers
Review of advance copy received from Indie Reviewers
December 28, 2025
Shep and Theo together are couple perfection 😘💯👌My prayers were answered from my review of Merciless, "I wanted more. More of the deliciously naughty Prince Theo, more of the disciplined Shep and definitely more of them together." It is safe to say that Ruthless delivered on everything!!!

The stakes were raised because not only did Ruthless deliver more, but the unhinged and usually uncontrolled Theo was focused on catching the bad guy, he was focused on his rage over feeling betrayed by his brothers, but most importantly, he was focused on Shep and his ever developing feelings for him. Theo wasn't alone in this game changing state since Shep was right there with him. However, the normally ever-in-control Shep was losing it and it was divine. The man who forever had a plan was only focused on Theo, which meant whatever it took to keep Theo safe, happy, and in his arms forever is where Shep's focus was. What a switch it was to watch these two not only fall for one another, but to loosen their grips on their entire personas because they found comfort in someone else. Someone who would always be there and love every piece of who they already were.❤️

Merciless may have begun this adventure with all the danger, spice and tons of lusty naughtiness 🔥, but Ruthless kept it going until the very last page. Kicking and screaming isn't enough to describe how wonderful I felt as I lit up over these two because I was so delighted over the emotional wonderment over it all. I will say it again, this is the ultimate Park Avenue Kings power couple❤️ These two were delightful on every single emotional level and I loved it, loved it, loved it!!

The love and passion intensifies between Theo and Shep while the hunt continues to try and catch the person responsible for the attacks on them. Ruthless begins with soooo much danger licking at both Theo and Shep's heels that I was tearing through the pages, but I should have remembered that these are the Park Avenue Kings and by the end of the book, my heart would be beating out of my chest for a totally different reason. 😉  With that said, there is only one PA King left to fall and while I'm sad there is only one story to go, I still can't wait to find out what happens next.❤️
Profile Image for Emily Hernandez.
1,444 reviews19 followers
Review of advance copy received from Indie Reviewers
January 1, 2026
After the way the first half of Theo and Shep's story ended, I was desperate to find out where their duet was headed next. This book not only delivered a satisfying resolution to the kidnapping plotline, it also brought the Kings back together again and made me fall head over heels in love with Shep and Theo's relationship. Out of all the books in this series, this one felt like it was the biggest test of the bonds between all the Kings, and it was rough to see the strain Theo's situation left on all of them. Shep was the one who let his instincts guide him towards the path that would bring his lover home safely, but that wasn't a magic fix for the cracks that had formed in the brotherhood. While Theo and Shep's love was central to the storyline, the book spent a decent amount of time exploring how the Kings made amends and reunited as a group, and I really enjoyed getting to see those interactions. I felt like I was finally getting to see the human side to all these larger than life personalities, and it made me appreciate all of them even more than I already did. In terms of the romance, Shep and Theo were as swoony and steamy as they were in the first half of their duet. Theo's capture definitely served as a wake-up call for the two of them, and once they stopped worrying about what everyone else thought, nothing could get in the way of their relationship. I adored how fiercely they each stood up for the other in this book, whether that was to other Kings, meddling family members, or the press. The love these two have for each other is incredible, and I had so much fun getting to experience them being happy together and living as their truest selves. Some might say that these two went over the top towards the ending, but I was right there beside them cheering them on the entire time.

**I voluntarily read an early copy of this book. This review expresses my honest thoughts and opinions.
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