Mary Anne and the Search for Tigger — Ann M. Martin

Mary Anne just loves her little kitten, Tigger. So when he disappears one afternoon, Mary Anne is a little concerned. The next morning Tigger is still missing...and Mary Anne is frantic. It's time for an emergency meeting of the Baby-sitters Club.

The girls pool together a reward for the return of Tigger, and they search everywhere for him. But there's still no sign of him...until Mary Anne receives a frightening letter in the mail. Someone has taken Tigger, and Mary Anne must pay a hundred dollars to get him back.

Is this some mean practical joke...or has Tigger really been cat-napped?