King Edward asks Sherlock Holmes to perform one more task before his retirement: to safeguard the Star of Africa on a trip to Cape Town. Soon the fabled jewel is stolen and several people end up being murdered.
| Actor | Role |
|---|---|
 Christopher LeeSherlock Holmes | Sherlock Holmes |
 Patrick MacneeDr. John Watson | Dr. John Watson |
 Jenny SeagroveLillie Langtry | Lillie Langtry |
 Joss AcklandKing Edward | King Edward |
 Richard ToddLord Roberts | Lord Roberts |
 Claude AkinsTheodore Roosevelt | Theodore Roosevelt |
 Anthony FridjhonConstantine Mavropolis | Constantine Mavropolis |
 Claudia UdyAmelia Roosevelt Morrison | Amelia Roosevelt Morrison |
 Neil McCarthyCaptain James Morrison | Captain James Morrison |
 Jerome WillisMycroft Holmes | Mycroft Holmes |
 Ron SmerczakLt. Grisholm | Lt. Grisholm |
 Margaret JohnMrs. Hudson | Mrs. Hudson |
 Stephen ChigorimboWaiter on Train | Waiter on Train |