Baby-sitters' Fright Night

On a school trip to Salem, Massachusetts, Kristy, Abby, Mallory, Stacey, and Mary Anne find a mystery instead: a famous diamond, the Witch's Eye, is stolen from a local museum. The Baby-sitters set out to investigate, but someone seems determined to stop them. Stacey's room is ransacked. Abby is followed. And then Kristy disappears!Abby's sure the BSC is cursed. And all the Baby-sitters agree: Whether or not the danger is supernatural, it's definitely real. Will they find Kristy, and the thief, before it's too late?