It's a summer change for the Baby-sitters Club, with major changes in the look and focus of Ann M. Martin's classic series. Throughout the summer, members of the club share feelings about who they are and where they are going in a special journal. Four members drop out of the club, bringing the group back to its original characters: Kristy, Mary Anne, Claudia, and Stacey. Four Friends Forever. Ann M. Martin is the creator of The Baby-sitters Club, which has more than 190 million books in print, making it one of the most popular series in the history of publishing. Her novels include A Corner of the Universe (a Newbery Honor Book), Belle Teal, Here Today, A Dog's Life, On Christmas Eve, and the Main Street and Family Tree series, as well as the much-loved collaborations P.S. Longer Letter Later and Snail Mail No More, with Paula Danziger. Ann lives in upstate New York.