Jump to ratings and reviews
Rate this book
Rate this book
The night it happened, it seemed like an impossible nightmare. There was no name on the note. No hint of identity or reason or anything. A single word, on the notes line: “She." Just those three letters.

The next day, I received another note. It too contained a single word: "belongs."

A third note, the next day. This time, two words. Four letters. "To me."

Ten million dollars, or our daughter would die.

And then, there was a knock on my door. A sleek black limousine sat on the curb in front of my house. A driver stood in front of me, and he spoke six words: "It's time to pay your debt."

Would you have gotten in?

I did.

It turns out there is no happily ever after for us.

430 pages, Kindle Edition

First published January 14, 2022

164 people are currently reading
779 people want to read

About the author

Jasinda Wilder

156 books12k followers
Jasinda Wilder is a New York Times, Wall Street Journal, and USA Today bestselling author of more than 100 titles including the #1 Amazon bestseller Falling Into You, the Audie Award-winning (best audiobook) Alpha, and the beloved, 17-book Badd Brothers series. She and her husband Jack Wilder have sold more than 7 million copies and have been translated into more than 20 languages worldwide. You can find them at their fairy tale cottage by a lake somewhere in Michigan with their 6 kids, 5 dogs, 2 cats, 2 bunnies, and way too many ducks and chickens.

Sign up for Jasinda's newsletter at http://eepurl.com/qW87T

Visit Jasinda's website www.jasindawilder.com

Follow Jasinda on twitter at www.twitter.com/jasindawilder

Join Jasinda on Faceboook at https://www.facebook.com/AuthorJasind...

Ratings & Reviews

What do you think?
Rate this book

Friends & Following

Create a free account to discover what your friends think of this book!

Community Reviews

5 stars
293 (54%)
4 stars
170 (31%)
3 stars
52 (9%)
2 stars
17 (3%)
1 star
5 (<1%)
Displaying 1 - 30 of 45 reviews
Profile Image for Jennifer Bowland.
130 reviews26 followers
January 12, 2022
I really loved this book. I read the original three Alpha, Beta, and Omega when they first came out and didn’t have a chance to reread them prior to Sigma coming out. I felt like I never left their world.

It was great getting to see old characters and to meet new ones. I would honestly love if in the future we got more of Corinna and her brothers story.

I received an ARC of this book for an honest review.
Thank you Jasinda and Novel Grounds for the opportunity to read and review this book! ♥️
Profile Image for Kelly.
480 reviews1 follower
January 18, 2022
OMG I’ve missed these characters and it’s great to see where they are 20 years on. This is following the lives of Val Roth and his family. Living in the Caribbean in a life of luxury. Val’s daughter, Corrina, gets kidnapped. It takes them a while to find out who’s got her and where she is, however it’s the kidnapper that needs to beware! The way how this book ends, suggests there will be another one and I can’t wait for more
Profile Image for Gina Meier.
461 reviews3 followers
January 23, 2022
I am so happy that these characters have all returned. Maybe Jasinda loves me so much that she was inspired to write about Gina again. Rina and Apollo are made for each other. However I believe her parents will not see it that way. This story will take you on a roller coaster of emotions and have you wondering what will happen next. I was shocked with the ending and I can't wait to see what goes next.
Profile Image for Anna.
824 reviews7 followers
February 8, 2022
This is set 20 years after. Val and Kyrie eldest daughter Corinne is kidnapped. The A1S team are pulled in together to formulate a plan to rescue her.

Corinne holds her own through out her kidnapping and imprisonment. After all, she has been taught by the best.
Profile Image for S.M. Stryker.
Author 25 books274 followers
January 24, 2022
Other than editing issues, the story is amazing. I loved the Alpha series, and this will be no different.
Profile Image for Ashlee.
176 reviews6 followers
January 25, 2022
I didnt think this series could continue you in such an intense and wild way but it does! Absolutely love the time hop and how the characters have aged. Would love to see a #5 and #6 even!
1,709 reviews5 followers
January 20, 2022
Loved it!

This is a wonderful series. I was hooked from the very beginning. The characters were wonderful. The storyline was spot on. The ending was intense but good.
Profile Image for Angel Stafford.
20 reviews
February 11, 2022
Amazing

As always I'm captivated from the first word to the last ... I want the next book! What happens next . You left me at a cliff hanger!!!!! Please write fast .. lol.
Profile Image for Laura ( Latteandbookz ).
1,385 reviews12 followers
January 18, 2022
Apollo and Rin have this amazing, hot chemistry that I couldn’t get enough of I was gripped from the start I don’t think that I could turn the pages fast enough there was just so much suspense and emotion.
This is such a wonderful read.
Profile Image for ReadTillDawnBooks ~ IG.
528 reviews8 followers
January 13, 2022
Like your romance novels extra spicy with enough suspense to have you seating on the edge and unable to put the book down? Sigma by Jasinda Wilder is exactly what you are looking for.
The heat between Apollo and Rin is at inferno level. The suspense and action leaps off the pages. At one point the author has you so enthralled in the story, you’re sure you know what is bound to happen. But noooo it doesn’t happen as you suspect. My internal struggle was real whether I wanted to continue reading to see what happens.. Of course there was no way, I wasn’t going to finish, I had to find out what was going to happen, but I had to prepare myself for the emotions. If that isn’t great writing, I don’t know what is.
There was no outside world while I was reading Sigma, and I didn’t even realize, that’s exactly what I needed. Now I need to reread the entire Alpha One Security series.
Profile Image for Maria Angie Mendoza.
3,172 reviews20 followers
January 14, 2022
Years later and I still remember this series! More importantly once I started this installment I was brought right back to this explosive and sinfully delicious world!
To say I was super excited when I learned this book was releasing was an understatement and it surpassed my expectations.
Fast paced, suspenseful and intense this super sexy this book kept me on the edge of my seat from beginning to end. Secrets, and revelations took a whole new meaning and it’s the writers magical writing skills that I blame for feeling all the feels with this read. Just when I thought the story was going on one direction, boom she went in another.
I hope we get more stories and now I have to re read this series!
Profile Image for LeslecturesdeMylene.
5,721 reviews85 followers
January 16, 2022
17/20 - https://www.leslecturesdemylene.com/2...

j'ai adoré l'alternance de point de vue qui nous permet de comprendre un peu toutes les facettes de cette histoire. Corinna est kidnappée par Apollo, sa famille fait tout pour la retrouver et en attendant, certains vont tomber amoureux l'un de l'autre... Les pages se tournent très rapidement et on ne peut que sourire en les voyant se battre pour ce qui compte pour eux et aller au bout de leurs idées. Corinna est une héroïne qui n'est pas du genre à baisser les bras mais plutôt à saisir les bonnes occasions, j'ai adoré aussi suivre sa mère et on ne peut que vivre chaque instant intensément. Les personnages sont attachants, un peu violents et le final est pour le moins intense ! A découvrir !!
Profile Image for Lindsey King.
842 reviews34 followers
January 17, 2022
Feels 3
Steam 4
Storyline 4
Overall Rating 4


Whew!! It’s been a hot minute since I’ve been in this world. So glad to be back! I seriously hope this will be a full second generation series. This book was awesome!

A blast from a supposedly buried past comes back with a vengeance like a thief in the night. Totally didn’t expect this at all. You’ve got to read this! Imagine Valentine in female form and you get his sassy daughter with a level head and smart as a whip. She’s soooo much like her Daddy.

Apollo….. yesssss!! My goodness this man! He’s strong, fierce, and definitely a worthy opponent to Daddy Val. I

Definitely a must read and super steamy. Jasinda does an amazing job as always!!
Profile Image for Marika.
4,842 reviews100 followers
January 17, 2022
This story took me by surprise! Now, I didn’t bother with the blurb as usual, so I didn’t know what to expect!
Started off with Valentine and I perked up lol..
But it's actually Corinna, his daughter's story.
I felt like I inhaled this story that's how fast it went!
Love Corinna..she is usually a very responsible and good girl..but now she is playing with fire..and that fire is Apollo.
I won't spoil but if you are reading this book I presume you have read the others..Still..
I loved how the story went but that ending..Holy moly..brutal! Can't wait for the next book!Because there is one, right???
Profile Image for CherryRed’s Reads.
977 reviews8 followers
January 17, 2022
This book was an exciting read!
I was presently surprised when Author Jasinda Wilder announced another book in this series was being released.
As soon as I got it, I devoured it!
Apollo & Corinna's story kept me on my toes. It is riveting, captivating, sexy, & will keep you guessing from the beginning till the end of what the outcome will be.
And all the feels!
Grab it!
4 🍒🍒🍒🍒popped!
Profile Image for Hi'D's Book Hub Blogger.
281 reviews2 followers
January 17, 2022
Sigma by Jasinda Wilder is the fourth book in the Alpha series and boy was it worth the wait! It’s literally 400 pages packed with angst, suspense and mystery! If you like your romances sexy and spicy you will love Apollo and Rin’s story! Their chemistry is on fire and keeps you wanting more! I can’t wait to see what’s next for this series!
Profile Image for Ann.
740 reviews
January 18, 2022
Sigma (Alpha Book 4)
By Jasinda Wilder
Main Characters: Apollo and Corinna (Rin)
I voluntarily and honestly reviewed this book without bias or persuasion from the author.
5 out of 5 stars
It figures that I would read the last book in a series but no matter, I loved it. I loved the characters and the storyline. So looking forward to Jasinda's next book.
Profile Image for Debbie.
857 reviews5 followers
January 14, 2022
Seriously? Come. On...... Talk about nail biting, suspenseful, emotional and maybe a little nerve wracking. But also addictive, exciting, entertaining and steamy. Plus, plus, plus. I can't write a review that will do this book/series justice. All I can say is, "Just read it."
Profile Image for Sandy Montemayor.
436 reviews4 followers
January 15, 2022
I loved this story, the chemistry between Apollo and Rin was incredible. I was hooked from the start, such a page turner. Intense, sexy, mystery and secrets revealed. It was also nice to hear about old characters and meet these new ones. I could not put it down, I strongly suggest this book.
Profile Image for Shirin Rasheed.
2,816 reviews41 followers
January 18, 2022
First of all I Love this Series. I love every book written by Jasinda Wilder. I am huge fan of her work and this stories always gives me the thrill.

Sigma is fantastic addition to this amazing Alpha world. I couldn't put it down.

I Highly Recommend all Readers to one Click this book now.
Profile Image for Tanya Graham.
1 review
January 17, 2022
Worth the wait

So good. So worth the wait. Storyline and spice 10\10. Fingers crossed another book is coming after that ending. Perfect.
Profile Image for StephieG.
89 reviews2 followers
January 26, 2022
From bad to good & HOT 🥵 in between

What a great addition to this serious with more to come obviously 🥳 it was a great read with all the old characters making an appearance. Rin was not what Apollo was expecting & it changed his life ❤️
608 reviews5 followers
February 4, 2022
Omg I loved this book, it was great catching up with characters from the other books. To see their children grown and living happily was nice. Corinna is taken and transported to Spain. The son of a long gone enemy has revenge on his mind. When they see each other the sparks fly. This us where the fun starts.
Of course there are obstacles for them to overcome. I can't wait for the next book .
55 reviews3 followers
February 5, 2022
Wow!!!!! Holy Mary Mother of God!!!!!! Amazing!!!!! Love Corinna and Apollo. Can't wait for Gamma!!!!!!!!
912 reviews5 followers
May 11, 2022
Dark romance

Plot spoilers alert.
Now, I enjoyed the original books in this series, I did, but couldn't quite get there with this book.
The whole next generation maybe? I don't know.
Part of it is because I didn't want Roth and Harry to be in their sixties. In my mind they are immortalised as forever young. Another reason would be that I felt the empathy built in the original books was being traded onto Rin.
As if learning her parents story gave an automatic connection to their daughter.
If this was the intent I'm afraid it failed.
I thought Rin to be a spoiled and childish character. Then suddenly she is a totally different woman within a couple of days.
Rin goes from oggling her best friends 15 year old brother to maintaining fortitude throughout her kidnap.
Until she falls at her kidnappers feet because he gives excellent orgasms.
Yeah, okay.
I know it's just a novel, but this is the man who had her taken from her bed, kept in the dark and subsequently sliced her leg to prove a point. He continually humiliates her and wants revenge on her parents.
I didn't miss the sub plot of how the mentally abused child arrived at crazy town, but his character is so cold I couldn't raise much sympathy at having Gina as a mother.
Then there is the whole 22 year old CEO of a massive multi billion dollar company
There is loads of swearing.
There are a few sex scenes written with a very explicit pen. Like, pages of them, most of which I skimmed.
There are some errors that irritated, missing words mostly but also some mixed tense.
As it is a next generation spin off I won't be purchasing the next book in the series.

3 reviews
March 29, 2022
The ending is terrible. The last pages ruined the entire book for me. There are several characters that are introduced early on, but you never see them again which is really sloppy writing. Additionally, the editing is so poor…there are typographical errors every few pages. Super disappointed.
Profile Image for whatjtreads.
1,221 reviews2 followers
January 16, 2022
This second generation installment focuses on Valentine and Kyrie Roth’s daughter Corinna and her love interest. Following this series since the beginning would enhance your reading experience, as there are a lot of old characters that shows up and it’s like a bad ass family reunion!

Val and Key are living peacefully on their Caribbean island, but unbeknownst to them, a reminder of an old and familiar enemy is lurking in the shadows ready to ruin their idyllic bliss. The sins of the previous generations are back to haunt Val and Key, but it’s Corinna who suffers. When she’s kidnapped, Val and Key would do anything to get their daughter back, even selling their fortune and exchanging their lives for hers. We get a reminder of how tough and passionate Kyrie is, as she would put aside her morals to ensure her daughter’s safety. While Val and Kyrie are gathering the Alpha 1 security team to get Corinna, she faces her own danger and uses her perceptive thinking and calm demeanor to keep herself alive. Her captor Apollo is a contradictory man, cold and unfeeling but with a passion for Corinna, unyielding in his business dealings but still takes cares of the people around him, always lonely but with a desperate desire for family. He yearns for acceptance so he hangs on to a past and a narrative that isn’t pleasant, but comforting to him because it’s all he knows. Only when Corinna believes in him and the man he can be that he can let go of a past that doesn’t serve him.

This story parallel some of Val and Key’s own beginnings, but is fresh enough so that Corinna and Apollo get to develop their own romance. Apollo truly is a Sigma, and he’s not just a sum of his past or his predecessor’s mistake. He’s not defined by the blood running through his veins or the misinformed expectations he has for himself. With the love of a good woman, he can be so much more than his last name.
Profile Image for Emma bramley.
2,570 reviews26 followers
January 29, 2022


Sigma (Alpha 4)

This is the fourth book in this series by this author. Wow what an amazing read from start to finish this book was. This book is packed to bursting with action, suspense, angst and mystery. This is the story of Apollo and Rin and omg the chemistry between these two is off the charts hot. Their chemistry will set the pages alight as you read. This is an amazing story to add to this amazing series of books from this author.

I was given a copy of this book and this is my honest review

Release date - 14 Jan 2022
Print length - 430 pages
www.obsessedbookreviews.com
Profile Image for The Smutbrarians.
2,239 reviews1,747 followers
January 17, 2022
Feels 3
Steam 4
Storyline 4
Overall Rating 4
Kindle eArc provided by Author
Reviewed by Lindsey

Whew! It’s been a hot minute since I’ve been in this world. So glad to be back! I seriously hope this will be a full second generation series. This book was awesome! A blast from a supposedly buried past comes back with a vengeance like a thief in the night. Totally didn’t expect this at all. You’ve got to read this! Imagine Valentine in female form and you get his sassy daughter with a level head and smart as a whip. She’s soooo much like her Daddy.

Apollo…yesssss! My goodness this man! He’s strong, fierce, and definitely a worthy opponent to Daddy Val. Definitely a must read and super steamy. Jasinda does an amazing job as always!
2,536 reviews21 followers
January 14, 2022
I voluntarily reviewed a copy of "SIGMA" What an excellent riviting, thrilling, interesting, entertaining, suspense fill drama with scorching hot scenes, secrets, mystery twist that have you glued to your seat your hooked from beginning to end.
Apollo & Rin's chemistry was sizzling hot their journey together is fast paced secrets get revealed you can't put down so much happens.
I definitely recommend to get this nail biting experience that grabs you it such an addicting read so well worth the read excellently written by Jasinda Wilder she never disappoints this is absolutely must have book you don't want miss getting. AWESOME AWESOME READ!!!!!!
Displaying 1 - 30 of 45 reviews

Can't find what you're looking for?

Get help and learn more about the design.