PG | | Crime, Thriller
Frederick Knott's first version of this story was as a play for television, first aired by the BBC in London in 1952. It was a huge success, and Knott was quickly persuaded to adapt it for the stage. The stage version was not expected to be more than a minor London success and was very modestly budgeted; the British actors were actually asked to wear their own clothes rather than specially-made costumes. In the meantime, the film rights had been bought by Sir Alexander Korda for only £1000; he never intended to produce it as a film, but sold the rights after the stage version had proved a substantial hit in both London and New York. His sale price is usually held to have been about £20,000, which rather annoyed Frederick Knott.
Margot Mary Wendice:
let me get you another drink. Mark, before Tony comes I ought to explain something.
Mark Halliday: Yes, I've been waiting for that.
Margot Mary Wendice: I haven't told him anything about us.
In the first scene Margo calls Mark "Bob".
The title is shown on a background of a British telephone dial; its MN/6 marking is replaced by a single large M which forms the single M of the title.
Filmed and originally briefly released in 3-D. Later shown in conventional, "flat" version. It was re-issued in 3-D in 1980.
$12,562 11 April 1999