This is a different kind of summer for Stacey. Since her fight with the BSC, Stacey's not baby-sitting much, and she doesn't have her best friend Claudia to do things with. So Stacey gets a part-time job at the department store downtown, and she finds a new group of friends.
Stacey enjoys hanging out with Jacqui, Sheila, and the other girls. They're serious shoppers, and they're really into music. These girls are fun. A little wild even. But Stacey's not sure how much she can trust them...until it is too late.
Stacey has left the Babysitters Club and becomes friends with a group of girls (Heather Epstein, Jacqui Grant, Sheila MacGregor, and Mia Pappas). However, when the group attends a famous concert, the girls begin to do bad things, causing Stacey to get in trouble and appreciate her friends. Before the concert, the girls were using Stacey's employee discount at a store in the mall to buy things then returning them for full price. At the concert, the girls bring in wine but get caught. They pretty much blame it on Stacey but luckily she had diabetes (yes, luckily) and she wasn't getting sick, so she couldn't have drunk the wine (which has sugar in it). Maureen grounds Stacey for three days. Afterwards, she has no friends and decides to return to the BSC, and she becomes a member again.
Ann M. Martin's Dear Reader Letter
In Stacey and the Bad Girls, Stacey and her friends get into big trouble when they go to a concert. I never went to a concert when I was Stacey's age. Instead, I went to my first concert when I was a junior in high school—almost seventeen years old. I went to hear a local group called Bop Shoo Bop that played 1950s doo-wop music. This was the early 1970s, when the TV show Happy Days was popular. My friend Beth was old enough to drive, so she drove us and a group of friends. Our parents knew what we were doing, of course, and nothing like what happened to Stacey happened to us at the concert. We just wanted to enjoy the music and have a good time. And that's what we did. I've been to a number of concerts since then, but that one will always be memorable.
Stacey's on probation in the BSC by the end of the book.
Dawn finds out Sunny's mom has lung cancer, which eventually gave Dawn the incentive to leave.