A young teenage girl, Katie, has no interest in school, her friends or gymnastics after losing her mother.
All that changes in the summer when she is asked to monkey-sit Gibby, her science teacher’s Capuchin monkey.
Taking care of the monkey changes her life in a big way. Gibby’s happy-go-lucky personality renews Katie’s zest for life. Gibby helps her with gymnastics, renewing friendships, a potential boyfriend and even overcoming her nemesis, a mean girl who is out to beat Katie at everything