When Bobby's grandmother was thirteen, she and seven friends disappeared for a period of six days. Bobby is determined that she will solve the mystery of the missing children, and with the help of her new, wary friend David, sets out only to find themselves in very scary situations. With the help of a crystal ball possessing magical powers that Bobby has just stumbled across, the two are transporte through a wormhole into another time dimension where the make startling discoveries, not only about their own ancestries but also about themselves.