Varney Ruthven has been diagnosed with V.A.D., Vampire Adjustment Disorder. He hates the taste of blood and longs to be a human boy who can go to school and play basketball during the daytime. Twelve-year-old Cedric, on the other hand, is desperately unhappy as a human. He hates that he's turning into his bully of a father, but he can't seem to stop. If only he could feel powerful and in control of his life, like the vampires he admires. Not surprisingly, when Camilla, a friendly witch, offers Varney and Cedric the chance to switch places on a trial basis, the boys jump at the chance. They have just thirty days to decide whether to make the switch permanent.
