Filmed in 1943, trade shown in October, 1944, released in early 1945.
Based on Barré Lyndon's stage play "The Man in Half Moon Street", which opened at London's New Theatre on March 22, 1939, and ran for 172 performances, starring Leslie Banks, Malcolm Keen and Ann Todd (source: "Blood on the Stage, 1925-1950: Milestone Plays of Crime, Mystery, and Detection: An Annotated Repertoire" by Amnon Kabatchnik, 2009).
One of over 700 Paramount Productions, filmed between 1929 and 1949, which were sold to MCA/Universal in 1958 for television distribution, and have been owned and controlled by Universal ever since.