Adam Hall wrote more than a hundred books for adults and children--some science fiction, fantasies, and horror tales but mostly war, mystery, and spy novels. He also published under the pseudonyms Elleston Trevor, Mansell Black, Trevor Burgess, Roger Fitzalan, Simon Rattray, Warwick Scott, Caesar Smith, Howard North, and Lesley Stone, as well as his real name, Trevor Dudley-Smith. His five-novel Hugo Bishop mystery series, published in England under the name Rattray in the 1950s, is striking for its psychological studies of deviant behavior. Hall's eighteen-novel Quiller espionage series, however, begun in the 1960s and continued throughout his lifetime, made his fame. These novels feature the psychology and exploits of a British secret agent, the Quiller of some of the titles in the series. In The 9th Directive (1966) one of Quiller's agency supervisors aptly describes him as "obstinate, undisciplined, illogical, and dangerously prone to obsessive vanities and wildcat tactics...