The grown-ups are out of town, and for Charley Decker, that means one thing: a last epic weekend with her older brother, Greg, before he leaves for college. Bring on the burgers, milkshakes, and movie marathons!

So when Greg ditches Charley for a date night downtown, she’s kind of crushed. Worse, he gets their mom’s boyfriend’s super-expensive, super-rare Mustang towed and needs Charley’s help to get it back. What’s an unsupervised seventh grader to do? Grab her best friends, sneak into the city, pull off the ultimate car heist, and then make Greg pay, of course.