Joan investigates her first solo case when a wife disappears. The missing woman left behind a tear-filled video that mentions a murder on a subway platform. While Joan searches for the vanished lady, Sherlock probes the murder.
Holmes takes a case from a man who claims to be Moriarty in hopes of finding his nemesis. Meanwhile, Gregson tries to get Joan to give up detective work and return to being a sober companion; and Sherlock's former lover, Irene Adler, appears.
A highly respected mathematician is murdered. Holmes investigates and tries to discover the purpose behind a guarded equation the victim was attempting to decipher. Meanwhile, Watson is conflicted when the son of a former patient asks her for a loan.
- Birth Name: Lucy Alexis Liu
- Birth Place: Queens, New York, United States
- Birthday: December 2, 1968, Sagittarius
- Profession: Actor, Producer, Model
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