Sherlock helps a math genius from his network of "Irregulars" experts after he stumbles upon a body while participating in a math puzzle competition. Meanwhile, Joan attempts to extend an olive branch after she learns about Kitty's past. Guest stars: Ophelia Lovibond from Guardians of the Galaxy, Raza Jaffrey from Homeland, Jacob Pitts from Justified, Rich Sommer from Mad Men, and Phil Simms from the NFL as himself.
Jonny Lee Miller: A huge day for me and my family. Thanks to the officers who made it so special. #newUScitizen #home #chokedup
Lucy Liu: Congratulations on your 🇺🇸citizenship!! @jonnyjlm ❤
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