Visiting a seaside mansion in Maine while caring for six young charges, Kristy, Claudia, Mary Anne, and Dawn are disturbed at the house's spookiness, and are further alarmed by strange noises and a ghostly figure

Fearing that someone is stalking them after a series of dangerous accidents, the Baby-sitters escape for a skiing weekend but become petrified when the trouble follows them and points to someone from their past. Original.

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?

The Christmas season takes on a spooky feeling when the members of the Baby-sitters Club become tangled up in a string of mysterious events.