One of the things all single-episode TV mysteries have in common besides being single-episode TV mysteries is ridiculous titles. The title of this week’s “Monday Mystery Theatre” (TBS, 9 p.m.) is “Obasan Kaicho Murasaki no Hanzai Seiso Nikki: Gomi wa Koroshi wo Shitte Iru,” which translates as “Middle-aged Chairwoman Murasaki’s Crime Cleaning Diary: The Garbage Knows Who Did It.”

Madame Murasaki is the chairwoman of a large conglomerate who nevertheless has a thing about corpses and housekeeping: She disguises herself as a cleaning lady to solve murders. Murasaki is played by veteran actress Tamao Nakamura and her sidekick, Nanako, by Tamao Sato.

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