Mantrap is a 1953 British second feature crime drama directed by Terence Fisher, starring Paul Henreid and Lois Maxwell. It was written by Paul Tabori and Terence Fisher, based on a 1952 novel Queen in Danger by Trevor Dudley-Smith. Camera operator Len Harris started working for Hammer beginning with this film, and later became a major contributor to the legacy of Hammer Films. Hammer was considering following this film up with a few sequels featuring the further adventures of private eye Hugo Bishop, but nothing came of it as actor Paul Henreid was on the fringe of the Hollywood "blacklist" at the time and his career was headed downward. Production began on June 16, 1952 and the film was trade shown on March 1, 1953, and released on March 16th.