Whilst visiting the Master, who has been exiled to a luxurious castle prison on a small island, Doctor Who and Jo Grant learn that a number of ships have vanished in the area. Whilst investigating these mysterious disappearances, Jo and the Doctor are attacked by a Sea-Devil, one of a submarine colony distantly related to the Silurians. Soon they discover that the Sea-Devils plan to conquer the Earth and enslave humanity, aided and abetted by the Master. What can Doctor Who do to stop them? Geoffrey Beevers, who played an incarnation of the Master in the classic BBC TV series, reads Malcolm Hulke's complete and unabridged novelisation, first published by Target Books in 1974.
- ISBN10 0491029543
- ISBN13 9780491029544
- Publish Date 18 June 1981 (first published 1 October 1974)
- Publish Status Out of Print
- Out of Print 18 October 2003
- Publish Country GB
- Publisher Virgin Books
- Imprint W.H. Allen / Virgin Books
- Edition New edition
- Format Hardcover
- Pages 144
- Language English