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LETHAL VOWS: A DARK MAFIA ROMANCE

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He’s my darkest craving. My deadliest vow. And the danger I’ll never walk away from.
Dario Russo is all power and precision—danger wrapped in a tailored suit and a voice that detonates good judgment.
He tried to protect me by keeping secrets.
He thought hiding me away in his Sicilian estate would keep me safe.
Now I’m surrounded by armed guards. Locked in luxury. And haunted by the man I can’t stop wanting.


I should hate him. I don’t.
I swore I was done. I’m not.


He’s cold to the world—but with me, he’s different.
Gentle. Devoted. Addictive.
And every touch pulls me deeper into something I can’t escape—something toxic, fated, and terrifyingly real.


The Bratva wants revenge.
The Camorra wants my loyalty.
And every buried secret about my father’s past makes it harder to pretend I ever had a choice.


Dario says this marriage is the only way to save me.
But I’m not sure if he’s giving me a way out…or dragging me under.



Lethal Vows is a dark, addictive mafia romance overflowing with steamy tension, dangerous secrets, and a possessive anti-hero who will stop at nothing to protect what’s his. It features a strong, emotionally driven heroine, an all-consuming love, no cheating, and a guaranteed HEA.

Perfect for readers who crave obsessive men, forbidden attraction, power struggles, and heroines who find strength in the fire.

This is the final instalment in the House of Russo duet, delivering the passionate, explosive conclusion to Dario and Katrina’s story.

351 pages, Kindle Edition

Published October 22, 2025

4 people are currently reading
3 people want to read

About the author

Jessica L. Cox

3 books4 followers
Jessica L. Cox is a dark romance author known for weaving passion, danger, and raw emotion into every story she creates.

Her books blend the seductive intensity of forbidden love with gripping suspense, complex characters, and high-stakes tension. From mafia power struggles to paranormal shadows, her stories explore the darker edges of desire — where obsession burns, loyalties fracture, and love demands everything.

Whether she’s writing about ruthless crime families or haunting supernatural bonds, Jessica delivers immersive, addictive romances that keep readers breathless until the last page.

If you crave love stories where darkness and devotion collide, Jessica L. Cox is an author you won’t want to miss.

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3 reviews
October 22, 2025
I absolutely LOVED the first book so I was super excited for this one. It did not disappoint! The first few chapters felt a tad long… but still kept me engaged and interested so the length wasn’t a huge deal.. I’m personally just used to shorter chapters. Other than that, I have NOTHING bad to say! It is spicy, suspenseful, heart warming and overall just a great read and a great end to their story! Definitely worth the wait! I’m looking forward to more books from Jessica!
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