Based on Frank Vosper's play "Murder on the Second Floor," which opened on Broadway at the Eltinge Theatre on September 11, 1929, running for 45 performances. The play marked Laurence Olivier's New York stage debut in the role of Hugh Bromilow, portrayed by Bruce Lester in the film version.
Frieda Inescort and Heather Angel are mother and daughter in the film but there is only an eight-year difference in their ages.
This film's earliest documented telecast took place in Tucson on Thursday, October 25, 1956 on KDWI (Channel 9); it first aired in Albuquerque on Monday, November 26, 1956 on KOAT (Channel 7), in Salt Lake City Saturday, December 8,, 1956 on KUTV (Channel 2), in Boston on Thursday, December 13, 1956 on WBZ (Channel 4), in Indianapolis on Friday, January 4, 1957 on WISH (Channel 8), and in Lubbock, Texas on Wednesday, August 28, 1957 on KDUB (Channel 13). TV channels have been able to show this movie for free since 1970, as United Artists Television, the last copyright holder and the successor to Associated Artists Productions, did not renew the copyright in a timely fashion.
The external views of the English boarding house is a giveaway that this is not a British production. Although most of the actors were originally British or Irish, the building style was more like brownstone buildings than the British Victorian town house the exterior purports to be.