11 Harrowhouse is a 1974 British heist comedy thriller film directed by Aram Avakian and starring Charles Grodin, Candice Bergen, James Mason, Trevor Howard, and John Gielgud in Panavision. It was adapted by Grodin based upon the novel by Gerald A. Browne, with the screenplay by Jeffrey Bloom. It was made at Pinewood Studios with extensive location shooting in London, Ragley Hall in Warwickshire and at Quainton Road railway station. The film's sets were designed by the art director Peter Mullins. The hand of Assistant Art Director John Siddall was used to paint the cockroaches.