Mary Morstan has received a pearl in the post every year since her father's disappearance. This leads Holmes and Watson to the truth about a secret pact between four convicts during the Indian Rebellion of 1857.
2002
1937
1999
2022
2020
1963
1978
1974
2017
2007
1998
1959
1997
2006
1990
2003
2024
2018
1995
