Just as her longtime BFF, Addy, is gravitating toward the popular crowd and starting to care more about school dances than tree house playdates, Mia finds out that her favorite science camp friend, Tariq, is moving to town and will be going to school with her. She’s super excited and can’t wait to show him around and help him make friends. But when Tariq arrives in town, he seems like he’s grown up a lot, too. He’s welcomed to Buttonwood Bay Middle School with open arms in a way that Mia can’t even recognize, and now she’s feeling more lost than ever. But then her science teacher announces the school’s science olympics, and she and Tariq are teaming up again to crush the competition—just like at camp. Only this time they’re joined by a couple of unconventional teammates in Kinsey (more artist than scientist) and the lovable, if also sometimes kind of gross and goofy, Evan.