The Secret of the Forest (1956)

A forester's two children, Knight and Day, become friends with two spoiled rich kids, Terrington and Cox, when the latter two come to the woods for a visit. The quartet gets involved with a gang of crooks when a valuable gold cup is stolen. The crooks then kidnap Terrington and Cox, but Knight and Day rescue them and help the cops nab the crooks. This was the first film directed by actor Conyers, who went on to make many other children's pictures and some good farces.