They also meet their cousin Georgina, a surly, difficult girl, who tries hard to live like a boy and only answers to the name George.

After visiting the wreck, the five arrive on the Island and are exploring the ruined castle when a huge storm blows up, making it too dangerous for them to return to the mainland.

The following day, the five visit the wreck and discover the captain's cabin, where they find some objects belonging to George's old relative, including a box which they take back to Kirrin Cottage.

On further investigation of the map, the children find the word INGOTS, which they later realise marks where the lost gold was buried.

Thinking the children want to spend time at the island before it is sold, Uncle Quentin and Aunt Fanny allow them to go camping there for one week.

Dick and Anne use the well shaft to rescue Julian and George from the dungeon, and the children devise a plan to trap the men when they come back to the island with a boat to steal the gold.

The gold is recovered, and it is determined that it legally belongs to George's family, making them rich and enabling them to afford everything they have ever wanted.