Twelve-year-old Seamus Hinkle is a good kid with a perfect school record—until the day he accidently kills his substitute teacher with an apple.

     Seamus is immediately shipped off to a detention facility—only to discover that Kilter Academy is actually a school to mold future Troublemakers, where demerits are awarded as a prize for bad behavior and each student is tasked to pull various pranks on their teachers in order to excel. Initially determined to avoid any more mishaps, Seamus nonetheless inadvertently emerges as a uniquely skilled troublemaker. Together with new friends Lemon and Elinor, he rises to the top of his class while beginning to discover that Kilter Academy has some major secrets and surprises in store….