Kristy's Great Idea is the book that started it all, which automatically makes it a classic. However, it also happens to be a genuinely terrific story of friendship that's full of iconic firsts for the club: Claudia's first fabulous outfit, the girls' first sitting jobs, and their first squabbles. Kristy, Claudia, Mary Anne, and Stacey are each established in such loving detail that they instantly feel like a squad you want to be a part of, and the fact that they possess some serious entrepreneurial spirit only makes them that much cooler.