About two different groups of children who encounter one another on a small piece of land in a lake which they both live by. 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 another boat and a stranger, 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?
Did You Know?
The espionage elements added to the film are inspired by the fact that the author of the book, Arthur Ransome, had actually worked for British Intelligence, spying on the Russians. The code name "S76" that appears in the film was Arthur Ransome's actual code name. See more
In the film's title sequence as the Walker family travel north, the children's map of their train journey shows that a huge lake over 100km across has appeared between the cities of Birmingham and Chester, somehow drowning the Midlands Plateau. See more
I object to weapons that can wipe out whole cities
Well I'm afraid neither of us is in charge of what our governments do
Version of Swallows and Amazons