Of all the BSC members, Kristy's the last one anyone would expect to have a secret admirer. But someone is sending her mushy notes with hearts all over them! Kristy and Shannon are pretty sure the letters are from Bart, Kristy's rival softball coach. But then the notes Kristy receives from her mystery admirer start getting a little weird. . .and creepy. Is Bart pulling a practical joke on Kristy? Or do the strange notes mean something more serious? Only the Baby-sitters Club can find out!