This is Book II of The Banshee's Embrace Trilogy
Half banshee Jacqueline Huston is confused. With the Brotherhood of Merlyn looking for her, the specter of Death wanting her soul, and having to live with the knowledge that her wizard boyfriend's son killed her husband, sometimes life feels a little chaotic. Then the Brotherhood kidnaps the love of her life, Toby Williams, in an attempt to convince her to join their crusade for power over other supernatural beings.
In this book II, Jacqueline comes to grips with her enormous powers--capable of reaping any soul, a temptation she must avoid at all costs. But will she be able to control her powers, or will she use them and risk losing everything in order to save the one she loves?