Since the dawn of mankind, the Cambion Order has guarded against an evil force that could tip the world into chaos. Half-demon demigods, they are gifted with various powers but immune to the magic that can affect and control their infernal sires.

 

Felix Blackwood runs an occult shop that is as controversial among his own kind as it is humans. Lonely and biding his time, he waits for the next conflict to arise, when real estate agent Cynthia James walks into his life to ask for help.

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Selling a historical mansion could finally prop Cynthia up and pay off her debts, but she wants to know the significance behind a mysterious and terrifying sigil discovered in the house basement. For Felix it's a dire sign of things to come, especially after a murder on the estate marks him and Cynthia as persons of interest to the local police.

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With the darkness awakening, Felix is torn between duty and protecting the woman whose very presence brings him happiness,  while Cynthia fights feelings of both burning desire and fear of this man who is not quite human.