Swallows & Amazons

Four children (the Swallows) on holiday in the Lake District sail on their own to an island and start a war with rival children (the Amazons).

Both groups try to claim the land as theirs and do so role playing as two sets of enemy pirates. Whilst this happens they encounter a mysterious man on a houseboat who accuses them of a crime they did not commit. They must now work together to work out who he is and why he is there, but have they got themselves involved in something much bigger?