Micky always has plenty to worry about. Her Dad's working in Bristol, her brother is obsessed with his magic tricks, and her mother is a non-stop worrier. But most of the time, Micky manages to keep things at home running smoothly ... until, that is, a mouse moves in to the family home. If Micky doesn't get rid of the mouse - fast - she knows her Mum will become a quivering mess. Micky isn't too keen on actually killing her new housemate, so she tries every other mouse-catching trick she can think of ... without success. Relief comes in the form of advice from Max Grimes, the new boy at school, who eventually helps Micky to save both her mother's sanity and the mouse!