Dark Harmony (The Bargainers 3 Thalassa Laura (2021)

There are worse things than death: things that lurk in the shadows, slip into your dreams and have no business existing. Things that once slept have now awoken. For Callypso Lillis, the fae magic running through her veins is both a curse and a blessing. The very thing that binds her to Desmond Flynn, the King of the Night, also leaves her vulnerable to the Thief of Souls, a man who wants to destroy the world and Callie with it. But the Thief is not the only threat looming over the Otherworld. Dess father has returned from the dead and wants revenge on the son who sent him to his grave. Des and Callie must find a way to stop both men, and time is running out. Forces are at work to tear the lovers apart forever, and death is no longer the worst thing they have to fear.