Bellona by Alessa Thorn

There’s one mortal who the goddess of war would burn the world for…and someone was just dumb enough to put a bounty on his head.

Bellona, the Roman goddess of war, lives in secrecy among mortals, concealing her divine identity while offering her services as a skilled protector and mercenary. It’s a dirty job, but someone has to do it, and she was totally fine with it until one day, when a mortal man kissed her, she experienced peace for the first time. And she’s been pouting about it ever since.
Rafael has never forgotten the beautiful angel of death who swooped in to save him twenty years ago. With a bounty on his head and his business partners ready to sell him out to the new head of a powerful mafia family, Rafael has no choice but to call a secret phone number that has been passed down through his family. He just didn’t expect the same mercenary to answer.