Swallows and Amazons

During the school holidays, the Walker children (John, Susan, Titty and Roger) are staying at a farm near a lake in the Lake District of England. While sailing a borrowed dinghy named ''Swallow'', they meet the Blackett children (Nancy and Peggy) who sail a dinghy named ''Amazon''. The Walkers camp on an island in the lake while the Blacketts live in their house nearby. However, they soon realise this has been the territory of the two other girls who sail the ''Amazon'', and the scene is set for serious rivalry. Eventually they make friends and agree to join forces against a common enemy – the Blacketts' Uncle Jim whom they call "Captain Flint" (after the character in ''Treasure Island''). Uncle Jim, normally an ally of his nieces, has withdrawn from their company to write his memoirs and has become decidedly unfriendly.