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...

Aboard a strange bus, a girl hears a sound coming from a hatch under her seat. When she lifts the hatch, a hand reaches out and grabs her. Then another hand and another! Are the body parts reaching for help ... or do they want something more?

After band rehearsal, students trudge through a snowstorm and onto a bus hat no one recognizes. The driver is missing, so one student begins to fool with the steering wheel and gearshift. That's a big mistake, maybe the last mistake he'll ever make!