In Phoenix, the young cowboy Caleb Colton meets the beautiful Mae late night in town and she asks for a ride to her trailer. It is near dawn and Caleb brings Mae that is in a hurry; he asks for a kiss and she bites him on the neck. Caleb's truck does not start and he walks home. However, when the sunlight hits him close to his farm, he starts to burn. His father Loy Colton and his sister Sarah witness a van that appears out of the blue and kidnaps Caleb. He is introduced to Mae's family: the leader Jesse Hooker, his mate Diamondback, the cruel Severen and the boy Homer. In common, all of them are predator creatures of night that need blood to survive. However, Caleb refuses to kill and Mae gives her own blood to him to keep him alive. Meanwhile Loy and Sarah are looking for Caleb; when they meet each other in a motel, Caleb has to choose between his beloved family or his love for Mae.