When Mika starts fifth grade at the middle school, her neat life gets messy. Separated from old friends and starting new classes, Mika is far from her comfort zone. And math class is the most confusing of all, especially when her teacher Mr. Vann assigns math journals. Art in math? Who's ever heard of such a thing?

Thirteen-year-old Emily Poe has been given the opportunity of a lifetime: A chance to attend the exclusive Audyn School in Manhattan. But to win the scholarship, she has to pass a test like nothing she’s ever experienced before: A nearly bare room, a set of strange clues, a locked door. And a mysterious organization - the Leopold Foundation - that’s watching her every move.

On his 11th birthday, Jackson is nervous about moving up to middle school where he knows he'll be bullied by older kids, so he makes his wish, "I don't want to grow up!" When his 12th birthday rolls around, he discovers his wish came true: he's still 11, and he's starting fifth grade (again). At first, this is the perfect life. Jackson is the smartest kid in his class, the best on his baseball team, and the star of the school band. But after a few years of being eleven, he realizes his life is passing him by.

Holly Ash is good actor. Just one downside: Most of the people she’s acting with have no idea they’re a part of her fiction. One that has been carefully constructed by the secretive company that Holly works for, known as D.O.P.L. Every assignment is a new role, a new name, a completely new self. Her newest role is “Margot” and her newest target: a boy her age named Will Aldrich.

Amanda is reliving her 11th birthday over and over again - even the fight with her best friend, Leo. How can she fix everything and put the day behind her? Only time, friendship, and luck will tell.