Wrath by Lana Pecherczyk

Betrayed. Alone. Angry.
Wyatt Lazarus’s ex-fiancée betrayed him in the vilest of ways, and he failed to see it coming. Now alone and ashamed, the unquenchable influence of his sin fuels his anger. Instead of redeeming sinners—he ends them. Wrath becomes his identity until a brutal mistake throws him into the path of a cheeky yoga instructor in need of a savior.
Misha Minski believes in karma, but after years of suffering blackmail from an old mafia acquaintance, it’s hard to stay strong. Soon her number is up. Rather than spend her last days wallowing in self pity, she’s determined to enjoy one last night of pleasure with her new mysterious protector, but instead, finds something much more—a future.
But when the evil Syndicate join forces with Misha’s psychopathic blackmailer, Wyatt must push through his bitterness and reunite with his heroic family, or the woman who gave him back his voice will be lost to him forever.