Borehamwood is a town in southern Hertfordshire, England, 12 miles (19 km) from Charing Cross. Borehamwood has a population of 36,322, and is within the London commuter belt. The town's film and TV studios are commonly known as Elstree Studios.

Blackmail is a 1929 British thriller directed by Alfred Hitchcock and starring Anny Ondra, John Longden, and Cyril Ritchard. Based on the 1928 play of the same name by Charles Bennett, the film is about a London woman who is blackmailed after killing a man who tries to rape her.