An evil king made a deal with the devil and received a deadly power that will defeat anyone standing in his way. It's up to a fearless warrior to find a magical sword, which's the only weapon that could stop him.

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). In the meantime, a mysterious man on a houseboat accuses them of a crime they did not comm