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.
Written by Enid Blyton and very much in the style of the bestselling Famous Five and Secret Seven stories, this is an adventure that will keep young readers hooked!
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