A woman and her bridegroom are found murdered in their bed the day after their wedding. It had snowed overnight and the killer left no tracks. It is up to an amateur detective to figure out what happened. Carefully and systematically, he pieces together the clues in this locked room mystery.
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Death at an Old Mansion is a 1975 Japanese horror film directed by Yoichi Takabayashi, based on the mystery novel The Honjin Murders (1946) by Seishi Yokomizo. It was entered into the 26th Berlin International Film Festival.