Something very sinister is happening on the mysterious Isle of Gloom and the children are determined to uncover the truth!
But Philip, Dinah, Lucy-Ann and Jack are not prepared for the dangerous adventure that awaits them in the abandoned copper mines and secret tunnels beneath the sea.
- ISBN10 0330333631
- ISBN13 9780330333634
- Publish Date 10 June 1994 (first published July 1967)
- Publish Status Cancelled
- Out of Print 21 November 2001
- Publish Country GB
- Publisher Pan Macmillan
- Imprint Macmillan Children's Books
- Edition New edition
- Format Paperback (A-Format (178x111 mm))
- Pages 336
- Language English