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.

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.

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 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.

Watson confronts a traumatic event from his Army days that still weighs heavily on him when his Army veteran friend’s wife reaches out begging for help when her husband is seemingly having a psychotic break. Meanwhile, Shinwell is asked for one last favor by Moriarty.