"Danny" (Bobby Driscoll) lives with his dad (Harry Morgan) and mum (Elisabeth Fraser) but isn't especially happy. Indeed, he feels neglected and determines to leave home and chance his arm in the outside world. Before he hits the road, though, he discovers an old diary written by his grandpa (Charley Grapewin) that details the trials and tribulation of his own youth - and tells of his desire to flee with his best pal "Duckface" (John Wilder) and join the circus. It's very hard work and the youngsters are largely ignored by the staff except, that is, for the clown "Bobo" (Poodles Hanneford) who ...