Short Synopsis
A coded warning of imminent danger sends Sherlock Holmes and Dr. Watson to the country house of the reclusive Jack Douglas. When they arrive too late to prevent a tragic death, they must follow bewildering clues and find a murderer.

Full Synopsis
"A great brain in London and a dead man in Sussex. It's the chain between that we are going to trace."

The famous detective Sherlock Holmes has been summoned by a coded message to the house of a man called Douglas. But he and his faithful associate Dr. Watson arrive to find they are too late: Douglas has been murdered, with a mysterious calling card left by his side. Scotland Yard is stumped, but Holmes, detecting the diabolical workings of his arch-enemy Professor James Moriarty, has some ideas of his own.