David and Monty are two friends of Susan and Betty Potter whose father runs a fleet of lorries. One by one, his lorries are involved in accidents and sabotage is suspected. The children are determined to find the culprits.
Geoffrey Orme
Writer
Mary Cathcart Borer
Writer
John Baxter
Director
Douglas Barr
Ivor Bowyer
Angela Glynne
Angela Fouldes
David Hannaford
John Longden
Carole Ann Ford
Howard Lang
Senior Police Officer (uncredited)
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