"The first thrilling instalment in Enid Blyton's Adventure series, now with a new cover look from rising picture-book star Rebecca Cobb.

For Philip, Dinah, Lucy-Ann, Jack and Kiki the parrot, the summer holidays in Cornwall are everything they'd hoped for. Until they begin to realize that something very sinister is taking place on the mysterious Isle of Gloom - where a dangerous adventure awaits them in the abandoned copper mines and secret tunnels beneath the sea.

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