The Best Episodes Written By Teresa Tuan

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.

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 and the team are faced with an impossible choice when two lives hang in the balance, but they only have one vial of antidote available. Meanwhile, Shinwell races to help the team, and Watson goes head to head with Moriarty.