The Baby-Sitters Club Super Mystery Series by Ann M. Martin, Nola Thacker, Jeanne Betancourt

Kristy, Claudia, Mary Anne, and Dawn are off to Maine to help take care of Karen and Andrew and the four Menders kids, whose parents stand to inherit the huge seaside house where the whole group will be staying.

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... moreOn 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? less

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.