A beautiful medical student travels to London to investigate the mysterious murder of her identical twin sister. Taking on her sister's identity, she gets closer and closer to the killer who is determined to finish the job once and for all.

A young woman commits suicide. Her sister is not ready to let the death go without someone answering a few questions. Namely, was it really suicide, and where is the large amount of money her sister withdrew from the bank the day before her death.

A French reporter working on a steamy story about the secret strip joints found in London's Soho district becomes involved in the lives of the owner and star of a famous club.

When Watson reads from the newspaper there have been two similar murders near Whitechapel in a few days, Sherlock Holmes' sharp deductive is immediately stimulated to start its merciless method of elimination after observation of every apparently meaningless detail. He guesses right the victims must be street whores, and doesn't need long to work his way trough a pawn shop, an aristocratic family's stately home, a hospital and of course the potential suspects and (even unknowing) witnesses who are the cast of the gradually unraveled story of the murderer and his motive.