The Sign of Mary
- Episode aired Jun 6, 2021
John's fiancee, Mary, asks Sherlock to uncover the mystery behind his father's odd actions and disappearance.John's fiancee, Mary, asks Sherlock to uncover the mystery behind his father's odd actions and disappearance.John's fiancee, Mary, asks Sherlock to uncover the mystery behind his father's odd actions and disappearance.