Ellie spent the summer before seventh grade getting dropped by her best friend since forever. Jack spent it training in "The Cage" with his tough-as-nails brothers and hard-to-please dad. By the time middle school starts, they're both ready for a change. And just as Jack's thinking girls have it easy, Ellie's wishing she could be anyone but herself. Then, BAM! they swap lives-and bodies! Now Jack's fending off mean girls at sleepover parties, while Ellie's reigning as the Prince of Thatcher Middle School. As their crazy weekend races on-and their feelings for each other grow-Ellie and Jack begin to wonder if maybe the best way to learn how to be yourself is to spend a little time being somebody else.