The island of adventure / The castle of adventure / The valley of adventure

About “The island of adventure / The castle of adventure / The valley of adventure”

This volume collects three adventures. In the first, Philip, Dinah, Lucy-Ann, and Jack holiday in Cornwall and uncover something sinister on the Isle of Gloom's abandoned copper mines. In the second, they investigate a feared old castle and its hidden rooms. In the third, a night flight on Bill's plane leads to his disappearance and a hunt for treasure in a lonely valley.