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Diesel Jones is a shifter with moon issues. Not the best combination to have. His dream of becoming a Sin City Collector had always lingered in the shadows because of his inability to control himself under a full moon. When Louie Fiore decides to test his merit, and gives him a job for the agency, Diesel jumps at the chance. But when he finds out he has to come up against an incubus, painful issues from the past resurface, and instead of bringing the sex demon in, he only has one thing on his mind--kill.

Sofia Cabrera is the new witch in town, and she's more than anyone bargained for. She finds herself drawn to Diesel, the sexy shifter, the first moment she lays eyes on him. When she becomes the target of an organization of incubi, who take what they want without asking, Diesel comes to her aid unexpectedly. They end up fighting the threat together, and in the process, Sofia discovers she--and she alone--can tame his rages.