Watson is thrown into a detective case when he is unsure whether the patient he is treating for one of the most rare ailments in the world, alien hand syndrome, is guilty of pushing his brother in front of a bus to his death.

Ingrid's lies come back to haunt her when her sister Gigi needs to be treated by the team after she develops side effects to the secret treatments Ingrid put her through. Also, Watson and Mary bond over a tragedy.

Watson runs into brilliant con artist and an old friend of Sherlock Holmes, Irene Adler, when her son Angus is admitted to UHOP for temporary paralysis. The fellows help Watson after he grows fond of Angus and pursue various leads to find a cure to his illness.

While Watson and the team help a woman whose memory resets every three minutes, Watson struggles with auditory hallucinations and questions whether someone is behind his current decline. Also, Moriarty plots his next move.

Stephens musters the courage to ask Watson to help him when his camgirl suddenly collapses during a video call. He does not know anything about her real life, so the team must act quickly to locate her before it's too late.

Watson takes a major ethical risk when he decides to treat a sickle cell patient with an unorthodox surgery, and the team faces their own dilemma when they must decide whether to look the other way or help the young woman.

When Sasha discovers a link between her current patient, who has advanced cancers and distinctive lesions on his tongue indicative of Cowden syndrome, and a cadaver she dissected during medical school, the team traces the case to Amish country.

Watson and the fellows treat a comedian who collapses at an open mic night, but throughout the case her past is revealed to be much more complex than initially believed.

Watson and the fellows investigate the perplexing case of a family man with a bullet lodged in his head who insists he is a Scottish soldier and seems to be hiding something nefarious.

Morris Chestnut stars as Dr. John Watson, who resumes his medical career as the head of a clinic dedicated to treating rare disorders six months after the death of his friend and partner, Sherlock Holmes, at the hands of Moriarty. Watson’s old life isn’t done with him, though: Moriarty and Watson are set to write their own chapter of a story that has fascinated audiences for more than a century.