Forbidden Area

Forbidden Area is a 1956 Cold War thriller novel by Pat Frank. Its plot involves Soviet sleeper agents intended to sabotage the U.S. war effort, who have been trained by classical conditioning to have an American "cover identity" that they can remember as well as their own. Rod Serling adapted it for the debut episode of the American television anthology series Playhouse 90, directed by John Frankenheimer and starring Charlton Heston, Diana Lynn, Vincent Price, Victor Jory and Charles Bickford.