Emma is tired of having to babysit her brother Jake, but when they have to go to the same summer camp, she has to watch him everyday on the bus and she feels like she cannot catch a break.
When the Popular Girls Club takes interest in Mia's keen fashion sense and decide to recruit her, Mia has to decide between them and the Cupcake Club members.
When Olivia, the new girl at school, says something nasty to Alexis in the hall way and has all the girls in the Best Friends Club teasing her, Alexis starts to wonder if Olivia misunderstood something she said.
Mia struggles to be nice to the new girl, Olivia Allen, after she makes pains to be nice and loans her some money only to discover that Olivia spends it to buy the exact same shoes for which Mia has been saving.
Mia tries to make friends with Olivia, the new girl, but when Olivia makes fun of the other Cupcake Club girls and tells Mia she shouldn't hang out with them, Mia must make a decision about her new friendship.
Worrying about her fashion prospects when she learns that she has to get both braces and glasses, Mia receives help from her stylish mom while embracing a chic new look for middle school and is reassured by her Cupcake Club friends that she is still the same old Mia.
Katie must rely on her Cupcake Club friends to help her deal with the change presented by her mom's new boyfriend and unexpected communication from her long-lost dad.
