Isolde and Johnny - the star-crossed teenage heirs to New Iberia's criminal empires - have run away together, and Robicheaux is tasked with finding them. But when his investigation brings him too close to both Isolde's mother and her father's mistress, the venomous mafioso orders a hit on Robicheaux and his partner, Clete Purcel.

In order to rescue the young lovers, and save hi self, Robicheaux must face a terrifying time-traveling superhuman hitman capable of inflicting horrifying hallucinations on his victims, and overcome the demons that have tormented him his whole life...