For years, a blackmailer has been preying on the weaknesses of others throughout London. When Holmes hears of the utter misery this mystery man is creating, he adopts a campaign to thwart his evil scheming. The campaign astonishes Dr. Watson by its strangeness and finds Holmes falling in love.
All episodes for season 1 are based on stories by Sir Arthur Conan Doyle, originally published in The Strand magazine and in Doyle's first collection of Sherlock Holmes short stories titled "The Adventures of Sherlock Holmes"
In addition to adaptations to some of Doyle's short stories from "The Return of Sherlock Holmes", there are also 2 feature-length TV movies based on novels written by Doyle: "The Sign of Four" and the ever popular "The Hound of the Baskervilles".
The final season of Sherlock Holmes as portrayed by Jeremy Brett. His appearance has changed and he will soon die of heart failure. The plan had been to adapt all of Doyle's Sherlock Holmes stories but time is running out for their star icon and Granada decided to end the series when Brett died. These are the last performances from a great British actor who is classed as portraying one of the world's most iconic presentations of Sherlock Holmes. The series was first known as "The Memoirs of Sherlock Holmes, after the title of the collected short stories written by Sir Arthur Conan Doyle.
A young solicitor, John Hector McFarlane, seeks Holmes's help after retired builder Jonas Oldacre dies in a fire. McFarlane, who benefits from Oldacre's will, is suspected of murder and asks Holmes to clear his name. Holmes looks for another motive and another killer, and dresses up as a tramp to get the information he needs about the Oldacre household. The surprising answer he finds is that Oldacre is not exactly dead.
Three years on from Holmes's fatal fall into the Reichenbach Falls, Watson wrestles with a murder case under his own steam. But who is the enigmatic stranger in the Coroner's court, listening intently to all the evidence? Holmes returns home and explains how he escaped death at Reichenbach, while Moriarty lost his life. Holmes and Watson must now bring a partner of Moriarty's to justice, by proving he is a murderer.
Holmes is curious about a series of attacks on figures of the French Emperor Napoleon Bonaparte around London. One such incident leads to a violent death, and he investigates. Lestrade sees an Italian connection and proposes to focus Scotland Yard's attention on the Italian quarter of London, but Holmes is more interested in Chiswick.
The daughter of scientist Professor Presbury sees her father's face at her second-storey window; Holmes connects this with recent zoo thefts.
Holmes and Watson attempt to thwart the schemes of the infamous blackmailer Charles Augustus Milverton from blackmailing Lady Eva Blackwell. But things do not seem as easy as they do and Holmes must sacrifice his morality and his honourable career to stop Milverton from wrecking her marriage. Holmes and Watson are called in to deal with a blackmailer. A dazzling young lady is about to be married, and Charles Augustus Milverton, the slithery king of all blackmailers, has letters she wrote to another man. Watson is astonished when Milverton calls at Baker Street at the invitation of Holmes, who has a plan to thwart him. As ever, things are not quite as they appear to be.