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

"Who's afraid of middle school? Not Katie Brown. After all, it can't be that different from elementary school. But, boy, was she ever wrong! After her best friend ditches her for a new group of friends called the Popular Girls Club, Katie is left alone and starts to wonder if there's an Unpopular Girls Club she can join. Luckily, Katie finds her way with a great new group of friends and together they form their own club. Four friends plus cupcakes...

Although Mia feels fairly satisfied with her life, she worries about who should attend parent-teacher night and her failing grade in Spanish.

While Allie is happy about how busy she is at the ice cream shop, she is surprisingly upset when Colin starts hanging out with Tessa, the guitar player in her friend's band.

Casey is planning lots of fun things to do over spring break with her BFF Lindsay. But her parents ruin her plans when they tell her she has to join them on a family trip to look at colleges with her older sister, Gabby. Casey is devastated until things take a surprising turn for the better when she runs into her summer crush, Matt! Matt is not only as smart and cute as Casey remembered, but he gives her an idea to make Donut Dreams donuts even more...

"Lindsay Cooper is about to start middle school. In her free time, she works at her family's restaurant, The Park View, handing out the world's most delicious donuts at the Donut Dreams counter. Her grandmother started the counter as a way to send Lindsay's dad to college, and Lindsay wants to use her job the same way--to make her dream of going to school far away from her small town a reality. Home feels different ever since Lindsay's mom passed...

Supported by her friends, Sierra enters a local singing contest, but her confidence falters when she sees her talented competition.

Tamiko and Sierra are excited about their upcoming school dance, leaving Allie, who goes to a different school, feeling left out.

"Things are slow at the cupcake shop this summer, and so when Mia's dad invites her on a long weekend trip to meet some of his college friends, she jumps at the chance, especially when she hears they have daughters her age. It turns out the girls work inan ice cream shop. Not only does Mia end up making new friends; she comes back with a new invention for the Cupcake Girls: an ice-cream cone cupcake"--

Emma is excited when she is asked to be a junior bridesmaid, but worries that she will not be able to work enough jobs to earn the money for the dress.