Reunited for the summer, the Swallows and Amazons with Dick and Dorothea launch a prospecting expedition to find the lost gold mine of the high hills above the lake. Worst of all is the sinister Squashy Hat, who appears to be a rival prospector and who's certainly a spy - how can they keep working w...

Reunited for the summer, the Swallows and Amazons with Dick and Dorothea launch a prospecting expedition to find the lost gold mine of the high hills above the lake. Worst of all is the sinister Squashy Hat, who appears to be a rival prospector and who's certainly a spy - how can they keep working without him discovering what they've found?