The Twenty Questions Murder Mystery, also known as Murder on the Air, is a 1950 British second feature[1] comedy crime film directed by Paul L. Stein and starring Robert Beatty, Rona Anderson, and Clifford Evans.

The film is a hybrid: the Twenty Questions sections take place in a studio recording of the BBC radio programme with the regular panellists and presenter.

A queue of people wait to enter the Paris cinema, a BBC studio used for radio recordings and broadcasts.

Inside, the Twenty Questions panel show is being recorded in front of the audience, and broadcast live.

While Mary investigates the judge's home, a fire starts and she is locked in a room and almost killed.

The panel concludes the clue links to "Rosemary is for Remembrance" (a line from Shakespeare's Hamlet), and from this they deduce it points to memory, and by sonance to Maurice Emery.

Meanwhile, BBC Commissionaire Tom Harmon goes to Mary and tells her the clue means her, not the general, linking to her surname: Game.

The Monthly Film Bulletin wrote: "Interesting glimpses of the radio team and the inside of Broadcasting House.