Rudolph has problems. Not only is he thirteen and a vampire, but the whole family is threatened with extinction by the cruel vampire hunter Rookery. Rudolph, fortunately, finds a twelve-year-old Tony, a human. Rudolph brings Tony along in his adventure, which takes the two boys to Transylvania, and brings their two families together, helping them overcome their prejudices against each other. Along the way, they face numerous dangers, and both vampires and humans must show courage and ingenuity.