The fifth graders of Liberty Falls Elementary have a reputation for trouble, but they still have a field trip to the mansion of Edward Minks (local inventor, founder of the town, and great-great-great grandfather of fifth-grader Eddie). While there, they search for secret inventions that are rumored to be hidden in the mansion--but they find that they are not the only ones searching, and somehow this class of trouble-makers must work together to thwart the thieves.