This is the remarkable story of what were known by the British as 'Q' Ships & by the Germans as ' Decoy Raiders'. Disguised as harmless merchant ships they could be transformed in moments into powerful killers & were used by both sides in the First World War. The book describes the extraordinary lengths that both sides went to ensure secrecy & deception. Voyages often lasted several years without returning to port. Owing to the nature of the game evidence regarding their work is hard to come by but Tony Bridgland has produced a fascinating piece of detective history.