Moving on with her Cupcake Club friends despite lingering resentment over being ditched by her former best friend for a more popular group, Katie resolves to confront Callie and struggles to find ways to repair the friendship.

"Emma is not thrilled with always needing to rearrange he schedule to babysit her younger brother, Jake, after school. But it's summer, and Emma is free--or so she thinks. Emma's parents have broken the news that really threatens to push Emma over the edge: Emma and Jake are going to the same day camp together. And Emma will have to babysit Jake on the bus. Every day. Can't Emma catch a break?"--Publisher.

The Cupcake Club questions its loyalties when Mia makes friends with a mean girl in disguise. There's a new girl in town, and Mia tries to take her under her wing. But Olivia Allen is not so nice, as a matter of fact, she might be even meaner than Sydney Whitman! Mia's been saving for weeks to buy a new pair of shoes, but when Olivia asks to borrow money, Mia gives it to her-only to find out Olivia spends the cash on the exact same shoes Mia has...

When the popular girls club takes interest in Mia, she has to decide between being popular and her new cupcake club friends.

"Katie has a tough time keeping one secret...what happens when she has to keep four? All of the cupcake girls have secrets and are ready to burst! Katie loves knowing a secret; it's just tough for her to keep them! And in this story all her friends have told her a secret! From new crushes to someone cheating on a math test, Katie doesn't know what to do with all of this juicy information! Can the Cupcake Club survive with everyone keeping secrets...

Unable to resist joining a new fashion club at school, Mia struggles to balance the activities of two clubs and clashes with rival Olivia Allen, who wants to be a fashion leader.

"He loves me, he loves me not...Alexis leaves a Valentine's Day surprise for her crush. Does he like her back? Despite objections from her Cupcake Club pals, Alexis makes a special valentine cupcake for her crush, Emma's older brother Matt, and leaves it for him next to his computer. Alexis is secretly hoping Matt will get the hint and give her a valentine, too. But ever since Alexis left the cupcake, Matt's been acting really uncomfortable around...

For as long as Katie can remember, it's just been her and her mom. But that's about to change. First her mom gets a boyfriend. And then Katie gets an email from her dad, whom she's never met, saying he wants to get together. Katie's not sure she's ready for so much change in her life. With so much happening at once, Katie's counting on her friends in the Cupcake Club to help her find the sweet side of what seems like a sticky situation.

Reaching a compromise with her parents when they say she is too young to attend a concert alone, Mia discovers that she is being cyberbullied on social media and teams up with her fellow Cupcake Club members to discover who is behind the attacks.