Dark Harmony

Callypso Lillis is a siren in the fae world, bound by magic to Desmond Flynn, the King of Night. The bond that ties her to her soulmate also leaves her exposed, and the Thief of Souls, a figure who wants to break the Otherworld and Callie along with it, is closing in.

A second danger has come from Des's own past. His father, who Des sent to the grave, has returned from the dead and wants revenge on his son. Callie and Des must stop both men while forces around them work to tear the two apart, and time is running out.

Dark Harmony is the finale of The Bargainer series, a dark fantasy romance of old hexes, palace politics and a heroine who has to step into the power she never wanted. It reads best after the earlier books in the series.