The hit series is back, to charm and inspire another generation of baby-sitters! Claudia's not worried when she hears her newest baby-sitting charge, Betsy, is a great practical joker. After all, how much harm can one girl do? As it turns out--plenty! Claudia breaks her leg because of one of Betsy's mean jokes . . . and now she's talking about quitting the club. Baby-sitting might be too dangerous. The rest of the BSC decides that Betsy needs to be taught a lesson--and the joke war is on! The best friends you'll ever have--with classic BSC covers and a letter from Ann M. Martin!