"You be me . . . And I'll be you."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 so 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.