Sherlock struggles to deliver the best man's speech at John and Mary's wedding reception; Sherlock tells the guests about past unsolved cases and inadvertently stumbles upon the identity of the murderer and his next intended victim.
To Sherlock Holmes, Charles Augustus Magnussen is the Napoleon of blackmail - and the one man he truly hates.
Dr John Watson and Sherlock Holmes arrive in 1895, where they face an enemy who appears to be from beyond the grave. They investigate the murder seemingly committed by a ghostly bride.