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They call me Sin for a reason.

As President of Las Vegas Defiance MC, I’ve built something real—a brotherhood that’s survived every enemy Vegas could throw at us. We’ve worked too damn hard to let anyone tear us down.

Then she walks into my clubhouse with a recorder and questions that could destroy everything. Elizabeth Hale. An ambitious journalist, who’s here to write about us, to expose the truth about her brother’s death—a truth that could get us all killed if she prints it before we’re ready.

I should keep my distance. Control the story and send her packing.
She’s fire and fearlessness wrapped in curves that make me forget she holds our fate in her hands. And when she looks at me with those defiant eyes, demanding answers I can’t afford to give, I realize I’m caught between protecting my club and protecting her from a truth that could destroy us both.

One wrong move and I lose the club.
One right move and I might lose myself to her instead.
Some secrets are worth dying for. Some women are worth the risk.
But Elizabethis the biggest risk of all.

From USA Today Bestselling Author K E Osborn comes the Las Vegas Defiance MC Series.
In the City of Sin, you’ll find hidden identities, a possessive alpha president, and dangerous deceptions. With found family forged in loyalty, organized crime conspiracies, and the ultimate choice between duty and heart, love becomes both a weapon and salvation.
This is Book One of the Las Vegas Defiance MC Series.

322 pages, Kindle Edition

Published December 8, 2025

62 people are currently reading
35 people want to read

About the author

K.E. Osborn

122 books1,639 followers
With a flair for all things creative, USA Today Bestselling Author K E Osborn, is drawn to the written word. Exciting worlds and characters flow through her veins, coming to life on the page as she laughs, cries, and becomes enveloped in the storyline right along with you. She's entirely at home when writing sassy heroines and alpha males that rise from the ashes of their pasts.

K E Osborn comforts herself with tea and Netflix, after all, who doesn't love a good binge?

Explosive. Addictive. Romance. www.keosbornauthor.com

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5 stars
85 (71%)
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28 (23%)
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4 (3%)
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Displaying 1 - 30 of 35 reviews
Profile Image for Doris.
3,674 reviews138 followers
December 6, 2025
Perfection

This author is one of my top MC writers and every time I see a Defiance MC book released I know it’s going to be epic. Now she is giving us the first book in the Defiance MC Las Vegas Chapter series and she’s done it again. This book grabbed me from the very beginning and didn’t let go until the last page was turned.

Sin is the President of the LV chapter and he is about to do something unheard of. He is letting a reporter into his clubhouse. Elizabeth is there for a reason and it’s not what the club thinks. To say that Sin and Elizabeth have chemistry is beyond words.

This book was packed full of secrets, betrayals, and steam which made it a big page turner for me. I always love the edginess of her stories and this is a great start to a new series. I can’t wait to see what she brings next.
733 reviews6 followers
December 1, 2025
Seriously this book had me sucked right in! I wasn’t sure what Elizabeth’s angle was and I was hoping Sin knew what he was getting into but then things changed, they changed!
2,705 reviews25 followers
November 22, 2025
4*
Sin is the president of the mc and is busy preparing for Elizabeth to see what the club is about,  but has he made the right decision for them all?
Elizabeth Hale sent to write about the club, she's curious about her brother how he was killed but has to be careful with her questions.
The two have chemistry and try to fight it. Sin needs to test if he can trust her with the truth?
A great start to this mc chapter.
Profile Image for Teresa Lara.
3,488 reviews53 followers
November 22, 2025
love this series
love the Defiance
loved Sin and Elizabeth heartstopping broken beautiful forbidden action packed insta love
love the twists
ready for more
gimme Nitro
Profile Image for World Of Books 65.
3,275 reviews62 followers
December 8, 2025
When one “gripping-your-handlebars” series ends, the mistress of raw, gritty MC romance returns with a vengeance. KE Osborn delivers an earth-shattering, pulse-pounding opener to what promises to be an unforgettable new journey—The Las Vegas Defiance MC Series, Book 1: Relentless.

And Relentless is exactly the right title.

From the very first page, the pace is unforgiving, the tension unyielding, and the storyline utterly spellbinding. Ms Osborn throws us straight into the powerful, unapologetic world of the Defiance MC, introducing a cast of characters so fierce, flawed, and addictive that readers will be desperate for more.

President of the club Sin is the kind of commanding, complex hero K E Osborn writes best—dangerous, loyal, and impossible to ignore. Pair him with Elizabeth, the journalist brave enough to walk into the club’s world for a story, and sparks don’t just fly—they ignite. Their chemistry sizzles, their push-and-pull is flawless, and their connection becomes the heartbeat of the book.

With danger stalking the club, secrets and lies—both past and present—threatening to explode, and passion burning hotter than the Vegas sun, Relentless grabs hold and refuses to let go.

And when this wild, gritty ride finally comes to a stop, you’ll be praying you’re able to release the breath you’ve been holding since page one.

An epic must-read start to a series that’s destined to dominate the MC romance world
2,306 reviews91 followers
December 7, 2025
In this first book of the Las Vegas chapter, Elizabeth Hale is a journalist out for the truth about her brother’s death, and to get to the bottom of it, she’s researching and writing an article about the Las Vegas Defiance MC. Sin, President of the Las Vegas Defiance MC, is in two minds about Elizabeth doing this but the club needs some positive PR.

I have to admit I was very wary about Elizabeth, yet at the same time, I liked her too. She shows such strength of character and certainly doesn’t back down when faced with a challenge. Sin is one challenge that she wasn’t bargaining on, though. Likewise, Sin wasn’t expecting to be so drawn to Elizabeth either. Their chemistry is off-the-charts.

There is a sense of anticipation, excitement (oh, that nursing home scene is amazing), fear and so much more in this story. This is an action-packed story that has incredible drama that leaves you sitting on the edge of your seat. Once I started I literally couldn’t put it down.

Don’t ever think you can predict what will happen in one of Ms Osborn’s books—the unpredictability of her stories is one of the main things that I love about her writing. There are twists and turns that make for exciting and entertaining reading. I look forward to reading the next book in this series.
Profile Image for Stefanie Kral.
764 reviews25 followers
December 10, 2025
✯✯5 Sin Filled Stars!!!✯✯

I’ve never been a fan of ending a series but I’m always excited for the start of K. E. Osborn’s new Defiance MC Series and this was no different.

I been waiting for The Las Vegas Chapter of Defiance for awhile. Sin was someone who I was wanting to get inside his head and he was better than I thought he was going to be!!!

I was shocked to learn that he was going to be letting Elizabeth into his clubhouse since she’s a journalist and she’s going to be asking questions and everybody who knows the MCS keep their secrets to themselves and their brothers and definitely away from outsiders.

Elizabeth’s going there for a story but she’s definitely got ulterior motives and she wants to know how her brother died but she’s gotta be careful when she’s asking questions.

Neither one of them were expecting to feel the things that they were feeling for the other one. That’s not the only thing that was going on in this story and I for one was loving every minute of it and I’m SOOO excited for the rest of the guys in this chapter to get trot stories told.
Profile Image for Gwen Shafer.
2,245 reviews43 followers
December 17, 2025
This is the first book in the Las Vegas Defiance Chapter series. She started this series off with quite a bang. I was gripped right from the beginning to the very end. There is suspense, twists and turns you don't see coming, chemistry off the charts and incredible drama. But the storyline is unbelievable.
Sin is the President of the Chapter but not by choice. He is literally thrown into the position. He has not had an easy life and literally put his heart on the back burner. He believes the Chapter needs to be seen in a new light, so he brings in a journalist. Elizabeth is that journalist. But she is there for so many other reasons. One being to figure out what happened to her brother who was a member of the Chapter. Does Sin know who she actually is? Does Sin know the secrets that she is keeping? Let me tell you those secrets are huge. As soon as Elizabeth walks in the door Sin loses his mind. The sparks are flying and intense.
This storyline is action packed. There is so much thrown into this storyline. But it is written so very well to tell the story of Sin and Elizabeth. You go through a sense of anticipation, excitement, fear and finally relief. If you love MC romance and want a series that is going to be one heck of a series to dig into this is the book to start. I guarantee this series is going to be absolutely amazing if this book is any indication.
Profile Image for Wendy Livingstone.
20.2k reviews259 followers
December 8, 2025
This is the first in a new series, and what an amazing beginning, Sin and Elizabeth’s journey is!
Sin is president of his MC, while Elizabeth is an ambitions journalist, who wants to expose the truth about her brother’s death.
This is a well written, easy to read, action packed, fast paced story, with found family, friendships, emotions, tension, betrayal, lies, danger, suspense, intrigue, loyalty, hidden identity, secrets, lies, deception, conspiracies, making choices, revelations, undeniable chemistry, and love, which leads to an entertaining, and unpredictable, addictive page turner.
I look forward to reading more from this talented author whose work I highly recommend.
Profile Image for Dana Busenbark.
2,801 reviews29 followers
December 9, 2025
In this first book in Las Vegas Defiance MC's storyline, we follow Sin, the chapter's president. What do we learn about him and his life from the age of about 13 and older? Who is Elizabeth? How and why does she come into contact with the MC? There were some big twists in this story for me. Wow. Who is Victoria? What does she do for a living? What secrets do we learn about? So many secrets come out. Who is Marcus? What do we know about him? Why does Elizabeth ask about him? What was she eventually told? What happens when Elizabeth's job conflicts with real life? What choice does she make? Who is Victoria? Read and see what happens!
Profile Image for Shannon Godwin.
3,052 reviews31 followers
December 8, 2025
Wow! Another great book! What a way to start a new series! I’m so excited for the next book. I could not put this book down! I live starting off with the president getting his ole lady first! For me this just starts the series out the way I live it. Hold on to your seat because you are in for a heck of a ride!!
Profile Image for Lora Cimino.
827 reviews16 followers
December 27, 2025
Outstanding!!

This is a fantastic story to start this new series. I started reading it and couldn't put it down. I read it in one sitting and didn't stop until I reached the happily ever after for Victoria and Sin. There are twists and turns that keep you turning page after page. It is a spicy love story with some angst and lots of action. You can never go wrong with a book written by KE Osborn.
2,758 reviews21 followers
December 10, 2025
⭐️⭐️⭐️⭐️⭐️

A fantastic start to a new chapter of Defiance MC. This is especially twisty and turny which is so much fun. Great MC read.
1,250 reviews18 followers
December 13, 2025
What a fantastic book to start The Las Vegas Defiance MC series with. I loved Elizabeth and Sin’s chemistry from the get go. This is a fantastic couple. So much angst, suspense and lots of twists and turns. That ending is fantastic. This author nailed once again with this book. I highly recommend it.
Profile Image for Terri West.
2,168 reviews
December 24, 2025
Love, love, loved it. Great read with a seriously well developed plot that was hard to predict. As always the characters rose from the page and truly stole the show. Looking forward to more from Vegas.
Profile Image for Sandy S.
8,332 reviews203 followers
December 6, 2025
RELENTLESS is the first instalment in KE Osborn’s contemporary, adult LAS VEGAS DEFIANCE MC erotic, MC romance series, set in the author’s Defiance MC world. This is journalist Elizabeth Hale, and thirty-seven year old, Las Vegas Defiance MC President Diesel aka Sin’s story line.

Told from dual first person perspectives (Elizabeth and Sin) RELENTLESS follows in the wake of the arrival of journalist Elizabeth Hale as she ventures into the world of the LVDMC. Elizabeth is hoping to write about the Las Vegas Defiance MC, research the who, how and why but Elizabeth is keeping secrets, and those secrets are about to threaten any chance for a future with the man with whom she will fall in love. Sinister aka Sin is the president of the Las Vegas Defiance MC, and a man who doesn’t trust too easily. A war is on the horizon with cartel known as the Hidden Hand Alliance but once again not everything is as it appears to be. Secrets and lies will expose both a personal and a professional betrayal, secrets that will dig further into the past than anyone could have ever imagined.

The world building follows several paths including the ongoing betrayal perpetuated against the Las Vegas Defiance MC. Elizabeth is on the hunt, and what she discovers throws a proverbial wrench into the direction of her ‘story’, a direction that reveals deception and betrayal at the highest level.

The relationship between Elizabeth and Sin is one of immediate attraction but Elizabeth struggles to cross an imaginary line, a line that is about to crumble and fall. Sin is determined to claim Elizabeth as his own but exposing the truth means heart break for everyone involved. The $ex scenes are erotic and intense.

There is a large ensemble cast of colorful, energetic and dynamic secondary and supporting characters. We are introduced to several members of the Las Vegas Defiance MC:VP Nitro, tech genius and secretary Ghost, SAA Koa, Mace, Bear, and his sons, Road Captain Deek and Will, as well as club girls Millie McLane, Ro: law enforcement Chief Detective Maria Moretti, Captain Rourke; Capo Lorenzo of the Hidden Hand Alliance. The requisite evil has many faces.

RELENTLESS is a story of secrets and lies, betrayal and vengeance, power and control, family and friendships, acceptance and love. The character driven premise is dramatic, edgy and engaging;the romance is seductive ; the characters are desperate, determined and decisive.

copy supplied for review
Profile Image for Ria Alexander.
2,677 reviews51 followers
December 7, 2025
The President & his Wildcat

KE Osborn is the Queen! She's done it again! RELENTLESS was the perfect emotionally charged, action filled beginning to her new series, Las Vagas Defiance MC . A forbidden relationship, a hidden identity, numerous secrets, betrayal, sizzling chemistry, and fiery heat, which had me glued to every word until its conclusion.

Sin, the President of Las Vegas Defiance MC, has done the unthinkable, he's allowed a journalist into the sanctity of his clubhouse. He wants to people to see the club as he does, as a family and a group of people who give to the community. Elizabeth Hale is there to investigate the club, to write an honest expose, but she also has another reason, one she keeps secret. The attraction and chemistry between Sin and Elizabeth is instantaneous, the glances they share are molten hot, and keeping their hands to themselves... impossible.

KE Osborn has delivered a story with numerous twists, heated passion, heartbreaking betrayal, steadfast loyalty, found family vibes, and plenty of love. KE gives so much depth to her characters, the emotions they experience, the friendships they have, and the effects their pasts have on their decisions in life. Sin and Elizabeth had so many decisions to make, would they make the right ones?

If there is anything I'm assured of when reading KE's books, it is that nothing is ever as it seems and there is always that jawdropping moment which has me saying "no way!", and she did it brilliantly in RELENTLESS. Drama, action, twists and turns, all woven superbly throughout Sin and Elizabeth's scintillating romance. The Epilogue has set up the characters for the next book, Fearless , and I can't wait for that one.

RELENTLESS is a thrilling and passionate ride that definitely should not be missed.

Read and Reviewed for Reading Is Our Satisfaction

✨✨✨✨✨ FIVE STARS
Profile Image for Stephanie S.
681 reviews2 followers
December 10, 2025
If I need some MC reads in my life I know just which author is my go to! Relentless the Las Vegas Defiance chapter is going to be another hit series.

This is Sin's story as President of this chapter he has not had an easy life and then the position was thrust upon him when the last president was sent to jail. He has stepped up and take this roll seriously that he knew the life and made his brothers in the chapter his life. Sacrificing his heart in the meantime. He was not anticipating Elizabeth the journalist who he was bringing in to write up an article on how the MC was not as most had thought them to be.

Elizabeth on the other hand had a different reason for being there as she need to see why her brother was killed and she knew it was because of the club and she was going to find out what really happened to him not matter what. Then things were not going according to plan, and she found out a totally different story that made her change directions.

Finding old ghost and getting the real answers is what you will find in this story, and I thoroughly enjoyed Sin and Elizabeth's story.

I am really excited to see Nitro's story next. The VP has a soft side you don't think anyone in an MC would have but I am ready for it.
Profile Image for Paige Wuerdemann.
527 reviews24 followers
December 5, 2025
Okay as long as K.E. Osborn keeps pumping out these Defiance MC books I'll be reading them because I am OBSESSED.

Since being introduced to the LV chapter in previous books I've always wanted more of them and to finally get their series is perfection.

Sin is the president of the Las Vegas chapter of the Defiance MC and he's prepping to let reporter Elizabeth in to see what the club is all about. Not everyone is happy with that decision as it could lead her to discover things not meant to be seen by others.

Elizabeth Hale is sent to write about the club, but she has ulterior motives- she's curious about the death of her bother and needs to know more. She's got to be careful though to not expose herself with her line of questioning.

Sin on the other hand does not expect to fall hard for this journalist and knows he's playing with fire. Their chemistry and sassy banter was magnificent. It soon gets complicated with many twists the reader doesn't see right away.

I absolutely cannot wait to see what comes next for this Defiance chapter. From reading the first book you know it's going to be a wild ride- especially in the City of Sin!
Profile Image for Kelchickbooklover.
2,087 reviews67 followers
December 7, 2025
A new series from the talented Ms. Osborn. When I read the teasers, I was hooked. Who knew that the president of the club could fall for someone who could bring down his family and the club? Right from the start, I was hooked by FMC Elizabeth, who was feisty, looking for trouble, but in reality was searching for answers to her brother's death. Then we have Sin, the Pres of the club, whose life has anything but what any man would want.
Sin was swept off his feet when Elizabeth, a journalist, came to the club to write an article on the club. There was something about her that intrigued me and I felt that she was hiding more than we were led to believe. Sin is everything I expected in a club Pres, sexy, very much protective of his family and an alpha all the way. When these two got together, boy, you could feel the pages catch on fire.
Just when I thought I had things figured out, Ms. Osborn threw a few curves at me. My head was spinning with the twists and turns that I sis not see coming. I needed to see what was going to happen between these two and the decisions that Elizabeth needed to make.
Profile Image for Reading  In the  Red Room .
3,273 reviews72 followers
November 29, 2025
That is definitely how you start a new series!!! Holy cow does this author write motorcycle romances like no other!! Sin is the president of his motorcycle club. These men are more than is MC brothers they are his family. Sin has decided to let a journalist into the club. She will study them, ask questions and hopefully write a truthful story about them…who they really are. The good, the bad and the ugly …hopefully more good!!! But what he is not expecting is to fall hard for her. Elizabeth is here to do a job…boy does she have secrets on top of her secrets! These two hit it off pretty quick and boy does it get complicated…in the best possible way. This well layered book has layers of left turns…and I was Here for it. These characters have incredible depth and told one heck of a story. A story about brotherhood, finding love when you least expect it and everything in between. Elizabeth and Sin had sassy banter and insane chemistry…crazy insane chemistry. I am soo darn excited for this series and can’t get the second book fast enough.
Profile Image for Mimirureviewbooks.
2,219 reviews
December 13, 2025
Relentless,this is book 1 of the Las Vegas Defiance MC Series written by the amazing author K.E. Osborn. This is Sin ans Elizabeth steamy and dangerous biker romance story. Diesel 'Sin' Moretti is the president of the Defiance MC in Las Vegas, he's sexy, possessive and his brothers and family loyalty are the most important thing to him. Elizabeth 'Wildcat' Hale is a journalist seeking the truth about her brother death. Their chemistry is off the charts!! The story line is full of great characters, sexy banter, hidden identities, brotherhood, organize crime conspiracy, lots of secrets, action-packed story and romance. Amazing start to a new series, the author doesn't disappoint. I can't wait to read what K.E. brings us next. I want Nitro's story next!!!
Profile Image for Renee.
5,240 reviews73 followers
December 8, 2025
I received a copy of this book from the publisher/author to review for Stephanie's Book Reports.

This is the story of Sin and Elizabeth. He is the president of the Las Vegas Defiance MC. The man has guts, I'll give him that. He is about to do something that is absolutely unheard of. He is going to let a reporter come into the club house. He is going to show Elizabeth what the club is all about. However, Elizabeth is a reporter and has other plans. She had a brother that was a member of the cloud and he lost his life. She is going to find out what happened
Profile Image for Karen.
1,510 reviews15 followers
December 12, 2025
This turned out to be a really good read. However, it was a slow start for me. I found the beginning to be hard to get into, but once I got about a quarter of a way into the book it heated up and became very interesting and a good read.

I look forward to reading more in this chapter of the Defiance MC. I've all of the other chapters I read so far and have fallen in love with so many of the characters. I look forward to getting to know more about the Las Vegas chapter and the characters in this chapter.
Profile Image for Joy Whiteside.
4,920 reviews114 followers
December 8, 2025
This was a fantastic read that grabbed me from the first page and kept me reading until the end. It moves along at a great pace that made for an extremely enjoyable read. I could not put it down and then when I was done I was needing the next book. These characters are fantastic and you will love them, no matter what they end up doing, you cant help it.This book will not disappoint. It needs to be read.
343 reviews
January 29, 2026
LVD

Another great Defiance story , the first of many. We have a reporter coming in to do an expose on the club. A president with wanting the truth told. A love story that has some lies along with truths. The elderly community was my favorite the MC bring so much joy to Nitros gran and her friends.. A crust cop tops it all off, oh and a mom back from the dead. WE ARE DEFIANCE!! On to the next adventure!😉💚💙
Profile Image for Ann L.
4,846 reviews39 followers
December 8, 2025
As one series ends another begins and this is a fast and gritty start to the new Las Vegas chapter of Defiance. This opener throws you right into danger, secrets, and a sizzling connection between the club president, Sin and bold journalist, Elizabeth. The tension never lets up, the chemistry pops, and honestly I couldn’t put it down. It sets the next books up to be just as wild and addictive.
165 reviews4 followers
December 10, 2025
A new city, a new story, same excitement! I was beyond happy to be back with Defiance! I thought they were gone from my world forever! I dont want to give spoilers but whoa! The main woman on a undercover mission that will turn everyone's world upside down! So many twists and turns ! Every time I thought i knew what was going to happen - i was wrong! So much action! wow.
Profile Image for Charity E. Beaudoin.
123 reviews
January 2, 2026
My daughter introduced KE Osborn, and I am so happy she did because I am hooked.

The chemistry between Sin and Elizabeth is hot. The plot twists, found family, and sexiness this book offers are amazing.

I cannot wait to wade more into the Defiance series.
Profile Image for Brooke Clanton.
812 reviews1 follower
January 3, 2026
Smoke and Mirrrs

This branch of the series is shaping up to be as good as the others! Sin is the perfect guy to lead the Las Vegas chapter and "Lizzie" is his match! You never know what is going to happen in Vegas and Sin and "Lizzie" were the perfect way to show that!
Displaying 1 - 30 of 35 reviews

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