Swinging, twenty-something Sherlock Holmes (before he becomes the famous detective we all love) shoots a young Dr. Moriarty during a street fight. All of London rejoices and Sherlock gets invited to cool parties, wears velvet coats and chicks go home with him to be privately investigated. It's Victorian bliss until the murder of some local bad guys gets Sherlock thinking that Moriarty isn't dead but very much alive and scheming to become the world's foremost importer of fine heroin. He teams up with a not yet bumbling Watson, falls in love with the prettiest girl in England, flashes back to childhood memories of his brother Mycroft getting addicted to smack and sword fights inside Big Ben.