Katie is about to burst when the rest of the Cupcake Club entrusts her with their secrets, but this group of best friends soon realizes that sharing and keeping secrets is what friends are for.

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 from one another? The girls soon realize they need to confide in each other—after all what are best friends for if not for keeping your secrets?

When Katie brings her maybe-someday stepsister to Cupcake Club, she gets her first taste of sibling rivalry—and it’s not very sweet! Katie’s mom asks Katie for a huge favor: will she spend some time with Emily, her boyfriend’s daughter? Katie agrees and brings Emily to a Cupcake Club meeting. Things go well—almost too well. Everyone likes Emily so much, Katie wonders if her friends like Emily more than they like her! And if her mom marries Emily’s dad, will Emily become her favorite daughter? Katie is an only child, so all this sibling stuff is new to her. She’s starting from scratch!

All Lo Campbell wants is to be a normal teenager—to go to one high school, live in one place, and have one real friend. Instead, she travels the country with her mother, chasing the unknown, the supernatural waiting out there... Until one day, the supernatural chases back. Determined to rescue her mom from whatever otherworldly being took her, Lo is going to need a Tracker—and lucky for her, she finds one. Shaw is strong, good-looking, possibly available, and utterly infuriating. Sure, he may have secrets, and his help costs more than a brand-new car, but she’ll have to deal with him if she wants to find her mother—and get her home alive.

Mia learns that you have to make your own luck—rather than rely on fun trinkets—in the latest addition to the Cupcake Diaries series. Mia is having a truly terrible week. So far she’s failed a pop quiz, ruined a batch of cupcakes, and even dropped some icing on her favorite shirt! But her cousins from Puerto Rico are coming to visit, so Mia has something to look forward to—and they even bring her a little lucky charm as a gift! When Mia’s luck immediately turns around, she’s convinced that her lucky charm really does have magic powers. But what will she do when her bad luck returns?

Katie is unpleasantly surprised to find out her family is moving into a new house after her mom’s wedding in the latest addition to the Cupcake Diaries series. Katie’s mom is getting married! Katie and her three best friends couldn’t be happier and have so much fun pitching in with getting ready for the big day—especially with cake testing! But when Katie finds out her mom’s marriage means her family has to move, suddenly the wedding isn’t as joyous an occasion. What will life be like in a new home with a new family?

Alexis gets a taste of sibling rivalry in the latest addition to the Cupcake Diaries series. After Alexis receives a stack of “practical” birthday gifts, she decides it’s time to change her image. She wants to be more like her carefree, popular older sister, Dylan. So, she tries out for cheerleading, without really thinking about what that entails. Not only that, Dylan was a star on her cheerleading squad, so all Alexis hears is “Dylan, Dylan, Dylan!” It’s time for Alexis to stop comparing herself to her sister and find her own special talent.