While on holiday, the Walker children spot an island. Borrowing a boat, they meet pirates seeking their uncle's trunk. After adventures with storms and cakes, the children and pirates learn friendship.
The Walker Children plain there Adventure to the Island They have been looking at through their telescope and Kitty makes a better Flag for Swallow and Susan and John struggle with the mast but finely they sail to the Island and start to set up camp the so called Amazon Pirates are sailing near by and have a sneaky bad plan they are going to put into action as they begin to spy on their uncle Jim
The Walker Children the Swallows meet the Amazon Pirates the Blackett Children and they have an Alliance and make plans of war
John rows to Dixon's farm for the milk from Mrs Dixon and today the Swallows are board Susan suggests that they go and pay a visit to the cloacal burners they have heard that they are friendly so they talk over plans of war and then go and meet Old Billy and Young Billy and their Adder and learn about the making of Charcoal
The Swallows and Amazons set out to try to capture each other's boats the Swallows set off and leave Kitty on the Island to sort out the leading lights to guilds them back in the other Swallows set out for the Amazon Boathouse when they get their Roger says Skull and Crossbones as he sees their sigin.
Things change when they Policeman comes aquesing the The Walker Children aka the Swallows of thief and setting a firework off on the deck of Jims houseboat but luckily the Amazon Pirates help them get out of this mess also Peggy grasses her knee
They have the battle at houseboat bay with Captain Flint, A massive storm breaks out and the Swallows and Amazons get in a tent together and make up a story together about a ship wreak just like in the second book SwallowDale when the Swallow gets shipwrecked Roger says one was called Amazon and the other Swallow Peggy gets scared and Nancy says my Mate dose not like thunder and it calms down and the Swallows and Amazons speak to captain Flint about his trunk will they get it back and will they Sail with the Amazons one last time up the Amazon River like Captain John says he wants to in the story.
