His Lethal Desire by Leighton Greene

There’s nothing more lethal than a hitman in love.
Johnny “Jack” Jacopo was once the Castellani Family’s top hitman, but one terrible mistake saw him kicked back down the ladder. So when the Boss orders him to look into the disappearance of a Hollywood starlet, Jack sees an opportunity to rise back up the Family ranks.
His first move is to question the missing actress’s twin brother. Miller Beaumont is charming, gorgeous, flirty…and he’s the same guy who was hitting on Jack in a bar the night before.
Jack tries to keep things strictly business, but Miller has access to inside information that Jack needs to solve the case. And it’s just too tempting when Miller proposes that they team up to find his sister.
As their search leads them into danger, Jack finds he has more to lose than he ever expected. Someone is coming after Miller, and Jack finds himself torn between duty to his Family and his own foolish heart.
Because despite himself, Jack is making one more mistake, the biggest of them all, the one dumb thing he swore he’d never do.
He’s falling in love.