When Watson reads from the news a er there have been two similar murders near Whitecha el in a few days, Sherlock Holmes' shar deductive is immediately stimulated to start its merciless method of elimination after observation of every a arently meaningless detail. He guesses right the victims must be street whores, and doesn't need long to work his way trough a awn sho , an aristocratic family's stately home, a hos ital and of course the otential sus ects and (even unknowing) witnesses who are the cast of the gradually unraveled story of the murderer and his motive.