287 pages
English language
Published April 29, 1983 by London, Eng., Octopus Books Limited.
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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.