Molly is about to start school and feels very grown up. To prove it, she persuades her parents to let her take care of an adorable lamb. But when Molly can't say "no" to the little darling, he becomes a troublemaker causing chaos on the farm, in the house, and even at school. Molly soon realizes that even little lambs need rules! Lesson: Having rules and setting limits make life better for everyone.