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.
- Genre: Adventure, Family
- Studio: Theatre Projects Film Productions Ltd.
- Keyword: island, holiday, boat, camping, based on children's book, 1920s
- Cast: Virginia McKenna, Ronald Fraser, Suzanna Hamilton, Simon West, Sophie Neville, Stephen Grendon