[1] It features the fourth appearance of the armchair detective Lancelot Priestley, who figured in a long-running series of novels during the Golden Age of Detective Fiction.

[2] In 1936 it was adapted into the film Twelve Good Men produced by the British subsidiary of Warner Brothers at Teddington Studios.

Directed by Ralph Ince, it starred Henry Kendall, Nancy O'Neil and Joyce Kennedy.

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