The famous Borgia Pearl, a valuable gem with a history of bringing murder and misfortune to its owner since the days of the Borgias, is brought to London, thanks in part to Sherlock Holmes. But before long the jewel is stolen, due to an error on Holmes' part, and shortly thereafter, a series of horrible murders begin, the murderer leaving his victims with their spines snapped and surrounded by a mass of smashed china.
Miles Mander
Giles Conover

Ian Wolfe
Amos Hodder
Charles Francis
Francis Digby, curator

Holmes Herbert
James Goodram, courier