Grey's Thirteenth Investigation is a 1937 French crime film directed by Pierre Maudru and starring Maurice Lagrenée, Raymond Cordy and Colette Darfeuil. It was based on play by Max Viterbo, inspired by the character of Inspector Grey created by Alfred Gragnon. It was the third of series of four films featuring the detective. The film's sets were designed by the art director Lucien Carré.

La treizième enquête de Grey (1937)
Directed by Pierre Maudru
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1937 Release, Author: Alfred Gragnon, Based On Play, Director: Pierre Maudru, Film Series, French Crime Film, Inspector Grey Character, Playwright: Max Viterbo, Set Design: Lucien Carré, Third In Series