Just as the Headmaster of Macdonald Hall is on the verge of retirement, a wave of practical jokes hits the school, and roommates Bruno and Boots become prime suspects.
Having broken her leg practicing for the annual Color War competition, Jenna is falsely accused of pulling a series of pranks that could get her sent home, and so, with little to lose, she begins planning her revenge.
Eleven-year-old Jenna Bloom is aggravated having her twin brother and older sister at the same camp with her over the summer and decides to exercise her own independence through a series of practical jokes that grow less and less funny to her friends.