The Unholy Night(1929)
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One dark foggy London night, someone tries to strangle Lord Montague, but he escapes. Only to discover the four other men who did get killed were old regimental comrades in Gallipoli. When Scotland Yard gets Monty to gather the other nine surviving officers at his home, one of them is murdered, and no one else has entered the house. Now, they must determine who the murderer is.