Reunited for the summer, the Swallows and Amazons with Dick and Dorothea launch an expedition to find the lost gold mine of the high hills above the lake, but the mining camp runs into all sorts of trouble.
Can you imagine finding gold? That’s just what the Swallows and Amazons and Dick and Dorothea decide to hunt for in the hills high above the lake. But it’s a hot and dry summer and water is in scarce supply. Worse still for the troubled campers, they have competition: Squashy Hat. Anybody can see he is a prospector. And talk about squashy hats! The children have never seen squashier. Just who is he and what sort of traps is he laying? Using pigeons to carry messages, braving dangerous mines and fires, the Swallows, Amazons and D’s Mining Company must stake their claim before their dreaded rival…