AllMovie

A young prostitute is brutally murdered by a psychopathic killer, while a group of masked men watch enthusiastically from the shadows... but the real mystery begins when an account of the gruesome crime appears in print several hours before the actual slaying took place! Time is ticking and bodies are piling-up as the great detective, and his faithful sidekick Dr. Watson, go deep into London's underbelly in search of the dreadful and phantom-like Shadow Watchers. What they discover will remain unpublished and locked in a vault for over a century --- until now.