12 November: This Day in Mystery

12 November 1939
Agatha Christie's The Murder of Roger Ackroyd, dramatized by The Mercury Players (founded by Orson Welles), is broadcast on CBS' radio's Campbell Playhouse.

12 November 1947
Emmuska, Baroness Orczy - creator of the Scarlet Pimpernel, the Old Man in the Corner and Lady Molly of Scotland Yard, dies at the age o82.