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Neurosurgeon Rowan Fielding has a problem. When she gets mad, she kills with her mind. Her search for answers sends her to New Orleans, home to her biological family and the spirit Lasher who has haunted them for generations. Ciprien (Sip) Grieve, a devoted agent to the Talamasca, is assigned to protect Rowan. He soon realizes he's in way over his head as secrets are revealed that could tarnish Rowan's family and his role in the Talamasca. As Lasher's seduction of Rowan deepens her role in an ancient prophecy becomes clear. This prophecy culminates in the birth of Lasher. Rowan is determined to use Lasher's powers to fulfill her purpose as a healer, but when tragedy strikes, she must put aside her own desires and fight to save her family. This proves to be a challenge as Sip and the Talamasca are also hell-bent on capturing Lasher. The battle to control him ultimately leads back to Donnelaith, the ancient stronghold of the Mayfair family.