Demons of the Deep is a single-player roleplaying gamebook written by Steve Jackson (the American game-designer, rather than the series co-creator), illustrated by Duncan Smith and originally published in 1986 by Puffin Books. It forms part of Steve Jackson and Ian Livingstone's Fighting Fantasy series. It is the 19th in the series in the original Puffin series (ISBN 0-14-031921-2). There are currently no announced plans to republish the book as part of the modern Wizard series. Demons of the Deep contains many successful endings, though some are 'more successful' than others. Source: Wikipedia (en)