This movie received its earliest documented U.S. telecasts July 31, 1944 on New York City's pioneer television station WNBT (Channel 1), in Washington, D.C. Thursday, August 14, 1947 on WTTG (Channel 5), and in Los Angeles Sunday, November 2, 1947 on KTLA (Channel 5). It first aired in Chicago Sunday, September 11, 1949 on WGN (Channel 9), in Detroit Sunday, September 19, 1949 on WWJ (Channel 4), in Atlanta Wednesday, October 5, 1949 on WSB (Channel 8), in Boston Sunday 23 October 1949 on WBZ (Channel 4), and in Cincinnati Sunday, November 20, 1949 on WLW-T (Channel 4).
Dan Armstrong (Edward G. Robinson) and Lady Patricia Graham (Luli Deste) fly out of Gatwick Aerodrome (the famous Beehive control tower is clearly visible) in a de Havilland DH86 Express. It is very unlikely that a service to Vienna operated from Gatwick at that time. However, it is a fictional story, so anything is possible.
The film performed badly at the box office, and Edward G. Robinson was widely felt to be miscast.
The cast includes Arthur Wontner, who played Sherlock Holmes in five films; Nigel Bruce, who played Dr. Watson in in 14 films; and Sir Ralph Richardson, who played Watson on radio (perhaps, the best Watson.)