Katie, a young teenager, is deeply affected by her mother’s passing and finds herself unable to shake off her depression. She becomes disinterested in her studies, distances herself from friends, and loses her passion for gymnastics. However, her life takes a turn during the summer when she is given the responsibility of looking after Gibby, a Capuchin monkey belonging to her science teacher. Caring for Gibby brings about a significant transformation in Katie’s life. The monkey’s cheerful and carefree nature reignites Katie’s enthusiasm for life. With Gibby’s help, she rediscovers her love for gymnastics, rekindles friendships, and even meets a potential romantic interest. Additionally, Gibby aids her in confronting her rival, a spiteful girl determined to outdo Katie in every aspect.