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Just a Regular Irregular

Sherlock helps a math genius from his network of 'Irregulars' experts after he stumbles upon a body while participating in a math puzzle competition. Joan attempts to extend an olive branch after she learns about Kitty’s past.
Aired: Nov 13, 2014 Genre: Drama Mystery CrimeCasts: Jonny Lee Miller Lucy Liu Jon Michael Hill Aidan QuinnCreated By: Robert DohertyDuration: 43m Rating: 3.9 Country: United States of America Production: Timberman/Beverly Productions, CBS Studios