When General Marchmouse unexpectedly joins the Nutmouses on a camping trip things soon begin to go horribly wrong. Before they know it, the mice are whisked downstream on Arthur's toy boat Bluebottle.
This is a moving story of a young boy who rescues an orphaned white lion cub from the African bush. Inseparable until Bertie has to go to boarding school and the lion is sold to a circus, the boy swears that one day they will see one another again.