Callie never meant to let it go this far.Sure, she may have accidentally-on-purpose skipped a day at her fancy New York City prep school, but she never thought she'd skip the day after that! And the one after that ... and ... uh ... the one after that ...But when everything in your real life is going wrong--fighting parents, bullied little brother, girls at school who just don't get it!--skipping school starts to look like a valid mental health strategy. And when Callie runs into Cassius, a mysterious and prickly "unschooled" kid doing research at museums all across the city, it seems only natural for her to join him--because museums are educational, which means they're as good as going to class. Right?Besides, school can wait. What can't wait is the mystery of why her grandmother seems to wish she could travel back in time to 1986, or what she wants so much to relive there. As Cassius helps Callie see the world in a whole new light, she realizes that some family secrets shouldn't be secret at all.