As a shifter Mark Guitron is uniquely equipped to search for the devil beast, El Chupacabra, and stop the horrible killings. Hunting one night by moonlight he spots another wolf whose aura tells him she is also a shifter. When he is visited by an erotic vision of her in human form he knows he must find her and make her his own. Chloe Hansen is searching for her friend who she’s convinced is a victim of the devil beast. When she meets Mark she feels a primal tug that tells her they are meant to be together. As the join forces in the hunt, they soon learn that sex between them feeds a need, rather than slaking it. The multiple orgasms barely satisfy their lust for each other, and as they draw closer to their prey they mate in the fiercest coupling yet.