S1, E4: Based on the popular children's picture books by Lucy Cousins, "Maisy" features a curious young mouse and her friends as they embark on simple adventures. In every episode, Maisy and her friends try new things and learn, and her discoveries help her deal with the world around her. Though the characters don't speak, the narrator understands their noises and communicates with them, explaining the stories to viewers. Maisy's adventures are designed to teach children lessons, such as sharing and simple problem solving.