There's a vampire loose in the town, terrorizing the residents and stealing an odd assortment of loot. When the gang does some sniffing around, they discover an unlikely suspect... Daphne's MOTHER. Things are already strained within Mystery Inc., and with this latest blow, the gang is truly torn in half. Girls on one side, boys on the other. Although they solve the mystery in the end, and prove it wasn't Daphne's mother, the rift in Mystery Inc. is now complete. They are a team no more.