Why is there a coffin-shaped shadow in the basement of the Zanker house? What's with the high-tech fancy black limo? Giant bats, late-night robberies, black capes... Could it really be 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!