Call of the Siren — Rosalie Lario

The half-siren half-demon bounty hunter Dagan Meyers swore he'd never settle down. His older brothers might've adjusted well to family life but tying himself to one woman is so not Dagan's bag. Until he meets the gorgeous angel Lina, his brother Ronin's long-lost adopted sister, and he can't think of being with anybody but her. Too bad Ronin's well aware of Dagan's party-boy lifestyle and won't let him anywhere near his angelic baby sister.

Lina is still getting over the abandonment issues that began when she was orphaned as a child and has devoted her life to taking down evil Otherworlders. The last thing she wants is to develop feelings for man she knows will eventually leave her, too. But as the battle against a growing darkness continues--a powerful fae who's harnessed untold power--Dagan and Lina find that love may be their greatest weapon against the very thing that threatens to destroy them all.