book cover of The Forbidden Promise
 

The Forbidden Promise

(2026)
(The third book in the Costello Syndicate series)
A novel by

 
 

CONOR

My job is to keep the Costello empire breathing—every server, every account, every threat cut down before it ever reaches the family. I'm good at it because I don't feel my way through a crisis. Infrastructure first. People second. Feelings, never.

Then Liam hands me the one assignment I should have refused: keep his sister alive.

Mackenzie isn't the fragile thing they've spent her whole life insisting she is. She's sharper than the men guarding her, steadier under fire than half my crew, and the one person in this family I'm not allowed to want.

I can't promise her safety. I can't promise I'll be gentle. But I made her a promise anyway— one that could get us both killed.

MACKENZIE

My whole life, my family has treated me like something to be guarded. Hidden behind walls. Kept off the board. Protected from a war I was born into. They call it love. I call it a cage.

I'm done waiting for permission to be dangerous.

I didn't expect Conor to be the one who finally sees me—not as Liam's little sister, not as a liability, but as the one person who can bring the Vore's entire empire to its knees. He's controlled, unreadable, and the last man I should ever let past my guard.

He's sworn to protect me. I'm about to prove I never needed it.

He wants to keep me safe. I want to be set loose. Neither of us is getting out of this untouched.


Genre: Romantic Suspense



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