Baby-Sitters Club Boxed Set #21 By (author): "Ann M. Martin"Genres:Young Adult books Childrens books Middle Grade books Kids books ISBN0590251546ISBN139780590251549AsinBaby-Sitters Club Boxed Set #21Original titleBaby-Sitters Club Boxed Set #21 (The Baby-Sitters Club, #81-84)SeriesThe Baby-Sitters Club #81-8481. Kristy and Mr. Mom 82. Jessi and the Troublemaker83. Stacey vs The BSC 84. Dawn and the School Spirit War