Ten-year-old Jerry is the master of mischief. He deploys stink bombs in his parents' lounge, soaps the aisle of his local school bus and surfs on his mother's ironing board. Adults burst into tears at the sight of him. But when Jerry's misdeeds go too far, a strange window appears. Behind the glass, monsters are waiting to pull him underground. Only good behaviour can save Jerry now. But being good can be very boring. Jerry and his friend Tyler decide to have one more adventure that will tempt Jerry's fate. Is it too late for Jerry to escape his monsters? Can Jerry actually change?