On holiday with their mother in the Lake District in 1929 four children are allowed to sail over to the nearby island in their boat Swallow and set up camp for a few days. They soon realise this has been the territory of two other girls who sail the Amazon, and the scene is set for serious rivalry.
Ronald Fraser....Uncle Jim
Simon West....John Walker - Swallow
Suzanna Hamilton....Susan Walker - Swallow (as Zanna Hamilton)
Sophie Neville....Titty Walker - Swallow
Stephen Grendon....Roger Walker - Swallow
Kit Seymour....Nancy Blackett - Amazon
Lesley Bennett....Peggy Blackett - Amazon
Brenda Bruce....Mrs. Dixon
Mike Pratt....Mr. Dixon
John Franklyn-Robbins....Young Billy
Jack Woolgar....Old Billy
Filmography links and data courtesy of The Internet Movie Database.