If Uncle Quentin had had the top-heavy ash tree lopped, the gale would not have brought it crashing down on to Kirrin Cottage, and then the Five would not have gone to Smuggler's Top to stay with Sooty Lenoir and his eccentric father.

But once there, queer and highly suspicious things seemed to happen, one after the other. Timmy, too, had his fair share of excitement, in and out of underground passages, and on the surrounding sea-marshes.

This is the Five's fourth adventure.