A coffin-shaped shadow in the basement of the old Zanker house. . . high-tech fancy black limo. . . giant bats. . . late-night robberies. . . black capes. . . and a vampire? In another action-packed mystery, kid sleuths Sean and Melissa Hunter need both faith and courage to crack their toughest case yet! With the "help" of Domesticus IV, an experimental housecleaning robot, the Hunters learn that you can't always judge a book by its cover.