Nat's class trip is a bigger adventure than she imagined! Nat is on an overnight class trip to Philadelphia, which is her first time in a big city without her parents. And it's a big deal because Nat's mom and dad are finally giving her the independence she's been longing for. But the trip is off to a bad start--with one disaster after another--and if things keep up, Nat's on track to lose her newfound freedom for good! Can she turn things around in time, or will her first chance with liberty be her last?