Dark Harmony (The Bargainers 4) Thalassa Laura (2023)

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