Stevie Lake is going on a class trip to New York City. While Stevie has visions of hanging out in Greenwich Village, her teacher has other ideas—long, boring lectures and a test. Well, Stevie has her own plans. She shakes her classmates and sets off to explore the Big Apple on her own. She ends up at the carousel in Central Park, where she meets not just people, but horses—including mounted policemen and riders from a nearby stable.
When Stevie's class wanders into the park, they don't have such a great adventure. In fact, they get lost. Now it's up to Stevie and her new friends to save the class and stop the school trip from turning into a disaster.