Since Rosie broke his bicycle, Caillou won't let her play with his toys anymore. He angrily hides all of his toys from his little sister. When Caillou breaks Daddy's guitar, he understands that everyone has accidents. That is when Caillou learns to forgive. In this story adapted from an episode of the popular television series, Caillou continues his explorations and gains a greater understanding of the world around him.