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The Devils Duet

A dark, morally grey serial-killer romance · 2 books
Sweet Little Revenge cover: a veiled crowned figure among blood-splattered roses

Sweet Little Revenge

Book 2
4.438 ratings · Amazon, Goodreads & StoryGraph
Read the blurb

Scarlet

Life hasn’t been kind to me, pushing me to the edge more times than I can count. My past is a patchwork of betrayal, loss, and scars that refuse to fade. But when I met Hayden, he saw beyond my pain, loved me for who I was, and made me believe in a future I never thought I deserved. He’s everything to me but how can I hold on to him when I can barely hold on to myself?

Hayden

Scarlet is the love of my life, the woman who turned my life upside down and gave me a purpose greater than myself. But loving her means facing battles I never expected—her pain, her fears, and the shadows of a life she’s trying to leave behind. Together, we face profound challenges that threaten to destroy the love we’ve fought so hard to create.

With new threats emerging, can our love overcome the greatest trials yet and forge a path to a future together, or will it all come crumbling down? This is our story. It’s messy, raw, and full of passion—and we promise, it’s worth every twist and turn.

  • Morally grey
  • Revenge
  • Serial-killer romance
  • 407 pages
Paperback£12.99
Hardcover£18.99
FREE on Kindle Unlimitedor buy the eBook for £3.99Read now →
But she? She thrives in the shadows. She bends the darkness to her will, shapes it into something fierce, something beautiful.
— Hayden
Content notes · 18+

This dark romance contains explicit content, including:

  • Foul language
  • Torture
  • Murder
  • Kidnapping
  • Graphic violence
  • Child death
  • Explicit consensual non-consent (18+)
  • Age gap
  • Physical and emotional abuse
  • Firearms
  • Explosives
  • Knives
  • Human and sex trafficking
  • Child abuse
  • Child rape
  • Graphic rape with objects
  • Drugs
  • Near-death experiences
  • Fertility issues

Your mental health matters, so please take these warnings seriously.

Book details
Released
22 March 2025
Series
The Devils Duet, Book 2
Pages
407 (paperback)
Paperback
ISBN-13: 978-1-83654-868-3 · ISBN-10: 1836548680
Hardcover
ASIN: B0F42ZS4WK
Kindle eBook
ASIN: B0DDYF24GP
Tropes
  • Revenge
  • Serial-killer hero
  • He’d burn the world for her
  • Healing from trauma
  • Morally grey
  • Dual POV
  • Happy ever after
Delivery
  • UK only for paperbacks & hardcovers
  • £4.49 postage per order
  • Arrives in 7–14 days
  • Ordering more than one? Books may arrive in separate parcels.
  • Outside the UK? Read the eBook on Kindle or Kindle Unlimited.
Delivery & returns policy →

What readers are saying

★★★★★Goodreads
I’ve been wanting to read the second book of this hawt little duet for ages! The plotline grips you from the start, it’s very dark… please check out the trigger warnings at the beginning of the book. Let’s chat a little about Scarlett because the way her character doesn’t back down from challenges, all the emotional and physical trials, is commendable. Kristy Ozolina, you really know how to make a reader’s heart ache, don’t you? She’s so strong! And Hayden, an unhinged serial killer, plus a cutie-pie? COME TO MAMA. I love how devoted and loyal he is to her, no matter what. The tension! Crackling like thunder! Amazing sequel. I do prefer this one if I’m being honest… It’s paced and written very well. Everything flows just right. (Read from an eARC.)
Tehmeena
★★★★★Amazon
Wow – I don’t even know where to begin, this book consumed me, hands down my favourite out of the two! The first half was so dark and raw and tough to read, but it was written so perfectly, that I honestly felt the pain Scarlet was going through. (Please read your trigger warnings – the first half is very dark) Even though our FMC had to go through the most horrific things, she came out as a fighter, she battled / still battles those demons, and now helps heal others and I’m just in awe of her character growth! And Hayden 🤤 god we love him!! The absolute definition of a man who’d burn the world down for his woman… I loved the glimpses we got of his pain, and how he was struggling with what happened to Scarlet. And then just their breathtaking raw love that they have for each other… honestly I just adore the two of them. And that’s why I spent the whole of the last 2 chapters sobbing my heart out, I’ve never been so happy at the end of a book before 😂 talk about a HEA!!! Wow!! Thank you Kristy for allowing me into this dark, twisted yet beautiful, heart wrenching world you have created.. 🖤
LottieReads
Goodreads
This book completely wrecked me in the best possible way.
Rachel Hollis
★★★★★Amazon
I loved this duet. Sweet Little Revenge kicks off with drama immediately! The details and descriptions are written beautifully, allowing the reader to bring the story to life in their imagination. This book is filled with many emotions, allowing you to feel more connected to the characters. Hayden is a strong male character who definitely gives off the “will burn the world for you” vibes!! Scarlet is a beautiful strong woman who will always put others before her! Kristy has really brought these characters to life! A brilliant dark romance! Now this book is part of a duet so please read Sweet Little Devil before reading Sweet Little Revenge. Please check the trigger warnings before reading as some may be upset by the material written.
Ainslie
★★★★★Goodreads
This book was even better than the first one. A lot darker than the first one so if you aren’t comfortable with reading about torture and SA then this isn’t a book for you. …The amount of emotion that is through this book is incredible. One thing I will say is that even though she went through a horrible ordeal and saw herself completely different, Hayden never stopped looking at her like he did before it all happened. And he helps bring her back.
Polished Pages by Fran
★★★★★Amazon
The amount of times I had to stop to cry, broke me so much within part one. I was not expecting this at all. My heart broke for what Scarlet went through. I could feel my heart breaking along with Hayden. Part two seeing her struggles with coming back into the world and adjusting back into ‘normal’. Watching her struggles within herself, towards the world and trying to process everything, broke me again. Part two made up with all the tears. Seeing Scarlet grow and work through her struggles was brilliantly written. And using her trauma to help children that had been through similar trauma like herself, creating a safe place for them to connect with others, be themselves, learn how to heal. Truly amazing. I will never forget this book, I will always be thinking about it. The ending was perfect.
Kerry-Anne
★★★★★Goodreads
Sweet Little Revenge is the second book in The Devil’s Duet, and dare I say… my favorite of the two! Yes, I said it! This book completely consumed me—I could not put it down for a second. With a dark and intense storyline, especially in the first half, this book pulls you in and doesn’t let go. Kristy Ozolina knows exactly how to write raw, gut-wrenching emotion, making me feel every ounce of Scarlet’s pain, strength, and resilience. And then there’s Hayden—his love and devotion are nothing short of breathtaking. The angst, the tension, and the passion between them? Absolutely electrifying. …Despite its dark themes (check your triggers), at its core Sweet Little Revenge is a stunning love story—intense, passionate, and deeply emotional. If you love dark romance with gripping storytelling, powerful character development, and a love that defies all odds, this book is a must-read!
Leah-Marie
★★★★★Goodreads
I loved every second of this second half to the duet. I loved how Scarlet lived through her traumatic experiences but as a way to make her stronger and not live stuck as a victim. And Hayden, bless him, was there for her and helped her through it, leading gradually to their (sweet in a messed up way) HEA. It certainly was a rollercoaster of a ride.
Amelia-Jayne
★★★★★Goodreads
Kristy has done it again! What a book, I cried, laughed and rejoiced right alongside the characters. This was a HEAVY book, check your trigger warnings before going in! This book truly showed Scarlet’s strength, all she endured and she kept going. The ending had me bawling, it was a much needed ending for these characters 💕
Gwhiz

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Reader questions

Do I need to read Sweet Little Devil first?

Yes. Sweet Little Revenge is book two of the Devils Duet, so start with Sweet Little Devil.

Does it pick up where book one ends?

Yes. It starts straight after the cliffhanger at the end of Sweet Little Devil, so there’s no waiting to find out what happens.

Is this the end of Hayden and Scarlet’s story?

Yes. Sweet Little Revenge completes the duet and gives Hayden and Scarlet their happy ever after.

Is it darker than book one?

Readers say the first half is the darkest part of the whole duet. Please read the content notes on this page before you start.

How spicy is it?

3 out of 5 chillies. There are still explicit, open-door scenes, but fewer than in book one, as the story focuses more on Scarlet’s healing. It’s for adult readers (18+) only.