|Just a Regular Irregular|
|Directed by||Jerry Levine|
|Written by||Robert Hewitt Wolfe|
|Air date||November 13, 2014|
|Previous||"The Five Orange Pipz"|
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.
One of Sherlock's 'irregulars' encounters a dead body when solving a math puzzle linked to a humongous prize amount. Sherlock and Harlan, find that atleast 16 mathematicicans are solving the puzzle. When two dead bodies are found in the course of solving the math puzzle, the police infer that perhaps the killer is targeting mathematicians. A clue is given to Sherlock and team when a few mathematicicans direct them towards a website run by someone called Mo who is working as something of a maths crusader to demonstrate and shame the unethical uses of maths. The person also has an fbi bulletin against them for having put some secret data on the website in their quest to detail the flaws in the calculation.
Harlan pooh poohs mos involvement and says he is a genius. Sherlock deduces that harlan is mo . Harlan admits this and is shamefaced in admitting he was copying Sherlocks actions. The team finally locates the killer when a misguided clue sends the killer in search of Mo to the wrong address