Baker Street purists won't have too much to quarrel about with this adaption of Arthur Conan Doyle's The Six Napoleons. Because of a master criminal's haste to get away, six people who bought busts of Napoleon Bonaparte are marked for death unless The Pearl Of Death is found.
Basil Rathbone and Nigel Bruce are on the trail of another master criminal, in the Sherlock Holmes stories, Professor Moriarty's second in command Giles Conover. Conover is played with a quiet menace by British colony regular Miles Mander.
What Mander is after is the Borgia Pearl which with its connection to the Borgias has as bloody a history as the fabled Star Of India. Rathbone already pulls a double switch on Mander and his lovely accomplice Evelyn Ankers. But later through a bit of Holmes own hubris Mander steals the Borgia Pearl from the British Museum.
But he doesn't have it long. Pursued by the police fresh from the theft Mander ducks into a pottery shop and hides the pearl in some fresh plaster busts of Napoleon, in one of six of them which are later sold.
Now he's on a mission to recover his loot and it's a bloody mission because Mander brings along in tow the Hoxton Creeper, a giant of a man who can and does snap people's backs to kill them. The creeper is played by Rondo Hatton and he brings this Holmes feature into the realm of Gothic horror. In fact Dr. Watson's knowledge of forensic medicine is called into play here when he correctly identifies Hatton's known method of homicide.
One of the better Basil Rathbone films from the Sherlock Holmes series.