11-year-old Kelly Farrow is a girl with a history of telling tall tales and bullying her younger siblings. One night, she locks her younger brother Patrick in the bathroom, which he fears greatly, and is punished by her father Gil, who "spanks" her. Afterwards, Kelly vows that he will never hurt her again. At school the next day, she hears a classmate tell a story about a relative who accused her father of molestation and had him sent to jail; this gives her an idea. Kelly tells her teacher Mrs. Hildebrant that her father has been sexually abusing her. Kelly speaks with the authorities, and they arrange to have her father arrested. The accusation and subsequent trial creates distance between Kelly and her family; mother Mary and sisters Jean "Nini" and Christina "Chrissy" doubt Kelly, given her history of lying and bullying. The only family member who believes her is Patrick. Gil's attorney Helen Browne picks her case apart in court by confirming that Kelly is technically still a virgin, and by casting doubt on the medical evidence of abuse. People come to believe that Kelly is lying because her father is known to be strict in his punishments, including prosecutor Susan Miori, and she struggles to get people to believe her. When older sister Chrissy tries to talk Kelly into dropping the case, Kelly confronts her with her knowledge of a secret that Chrissy herself has completely repressed her memories of: throughout her childhood and adolescence, Gil abused her, and switched his incestuous attentions to Kelly after Chrissy left home. As they are talking, Patrick becomes hysterically frightened after being left alone in the bathroom with Chrissy's husband Keith. Shell-shocked, Chrissy realizes that not only was Kelly telling the truth, but that Patrick has also suffered at the hands of their father, which is where his fear of being locked in the bathroom stems from. After confronting her father, Chrissy defends her sister by telling the court of her own abuse, which parallels Kelly's account. The next day, Gil is convicted and sentenced to prison for 10 months and probation for 2 years. The judge apologizes to Kelly, stating that age is not a factor in determining honesty. He goes on to state that he wants a full investigation into Chrissy's allegations, and into Gil's relations with Nini and Patrick. While Mary and Nini are shocked and devastated at the situation, Kelly walks out with Chrissy and Patrick, relieved that she was finally believed.
