Three kids get mixed up with jewel thieves and stolen diamonds in a 24-hour road rally.
Robert 'Bobby' Stewart
Henry Stewart
Insp. Cook
Mercer
Finch
Wheeler
Jock
Sir Hilary Stanton
Lady Truesdale
Gus Ashley
Benjy
Charlie Todd
Susan Stewart
Elizabeth (uncredited)
Peter Pitt
Steward
Whiteman
Junkman
Billy
PC Andrew
Steward
Mrs. Maggie Stewart
Insp. Timothy