Jared Harris. The film is specifically influenced by Conan Doyle's work A final Problem, but it is an independent story rather than strict adaptation.
Sherlock Holmes (Robert Downey, Jr.) tracks Irene Adler (Rachel McAdams), his old lover and also a master criminal, who is acting to be a courier for Professor Moriarty (Jared Harris). Moriarty is the prison mastermind, Holmes' intellectual equal, behind the criminal activities within the first Sherlock Holmes film within this series. After slipping Holmes, Adler delivers a package to your doctor at an retail. During this very quick exchange, mention is made of any note from a Moriarity conspirator for your conspirator's sister. Holmes reappears. As Adler's package is revealed as a bomb, Holmes and Adler spar and Holmes steals the take note from Adler. Although he defuses this bomb, Holmes fails to steer clear of the doctor's assassination. Adler reports to Moriarty by meeting him at the public restaurant. Moriarty then releases Adler through his employ, saying that her emotions for Holmes have sacrificed her usefulness and resulted in the theft of the particular letter. Adler starts to leave, but then stumbles and falls as Moriarty had poisoned her tea.
The next day, Dr. Watson (Jude Law) is around to be married and arrives at Holmes's home, ready to go out for a stag party he thinks best man Holmes offers arranged. Holmes shows himself being upset by Watson's relationship to Mary (Kelly Reilly). Holmes has become dissolute, living on caffeine, tobacco, and coca leaves along with drinking embalming fluid. He also reveals his experiments in urban cover up, hiding in plain look. Holmes reveals that he's investigating a seemingly unrelated number of crimes, believing them all associated with Professor Moriarty. Holmes believes Moriarty is actually using his connections and wealth to arrange 'anarchist' bombings in Italy and Germany, creating tensions between the two countries.
Holmes introduces Watson to his brother, Mycroft (Stephen Fry), who has an undefined, high level role with all the British government. Mycroft informs Holmes he must attend a contentment summit in Switzerland soon as a result of recent bombings. As the three advisors reach the party, Watson realizes Holmes possesses failed to invite some of the guests Watson had expected. At the 'party', it becomes apparent that Holmes has taken Watson there to find another intended target associated with Moriarty's, a fortune telling gypsy referred to as Sim (Noomi Rapace). Holmes shares the taken letter with Sim, tying her to Moriarty by means of her brother, Rene. Holmes also informs Sim which Moriarty has sent the assassin to kill your ex. Holmes attacks the assassin, eventually escaping with Watson and arriving the next day still drunk, late, and in scandalous outfit for Watson's wedding. Following the ceremony, Holmes is told to meet up with Moriarty at the University or college. Holmes meets with Moriarty, who warns Holmes if he persists in analyzing him, Watson and his wife is going to be targeted, and that Holmes' fan, Adler, had already been mortally wounded.
The next day, Holmes stows away, disguised as a female, on the train acquiring Dr. Watson and Mary for their honeymoon destination. While in transit, several dozen of Moriarty's males, disguised as attendants in addition to British soldiers, attack Watson and Betty. Holmes throws Mary from the train into a deeply river, where Mycroft picks the woman up and takes her to his home. Watson, though furious, agrees to travel having him to Paris to be able to confront Moriarty - that's traveling on a lecture tour - and discover the gypsy whom Holmes got saved earlier. When the duo get to France, Holmes locates Sim, as she is the only real clue to Moriarty's programs. He tells Sim in which Moriarty targeted her due to her brother Rene's use him, and she was a loose end who does be killed. They deduce Rene's location in Paris through the note that Holmes stole from Adler previous to her murder, and arrive there to identify a radical anarchist group in which Rene and Sim used to work for. The anarchists had already been forced to plant bombs upon Moriarty's behalf, in part because Moriarty possesses kidnapped the leader's better half and children. The leader informs them that this last bomb had been planted that night, and that his household would finally be free if he tangled up loose ends. He then commits committing suicide.
Holmes, Watson, and Sim follow this clues that Holmes deduced assuming that Moriarty would strike inside Opera and arrive presently there that night. Holmes realizes too past due that Moriarty has duped him when he discovers that Moriarty occurs. Instead, a hotel where a major business meeting was occurring is inflated. As Holmes looks over the bodies, he realizes the blast was a cover for a gunman of Moriarty's, Colonel Sebastian Moran (John Anderson). Colonel Moran was previously the finest sharpshooter in the English Army and had virtually supernatural marksmanship. Just prior to your bomb exploding, Moran shot a German businessman for the party, ensuring his death. Holmes notes that the businessman had used a massive arms company, which had recently had most of its stock purchased by means of an unknown investor. Holmes, believing the investor is Moriarty, crosses the border with Watson, Sim, and her gypsies, investigating one of the business's factories in Germany. Holmes and Watson independent, but Holmes is seized by Colonel Moran and interrogated by Moriarty. Moriarty tortures Holmes by impaling him through the shoulder on a beef hook, lifting him off involving his feet, and dancing with him as he could be suspended. Moriarty reveals he owns shares in companies across Europe in cotton, guns and other things, and plans to commence a war that will produce a large demand for these and make him a lot of money. Watson, attempting to save Holmes, is nearly killed by means of Colonel Moran, but manages to break free by collapsing Moran's sniper nest in a very large, lighted tower. The tower's collapse virtually kills both Holmes along with Moriarty. The duo rendezvous together with Sim and her gypsies, pursued hotly by In german Army soldiers and Colonel Moran. Most of the gypsies are generally killed by artillery and mortar fire, as are the In german soldiers. Moran is shot, but not killed, by Watson, as the gypsies, Holmes, and Watson attempt to be able to board a moving train to flee. Only Sim, Holmes, Watson, and one other gypsy help it become onto the train. Holmes, suffering from multiple shrapnel incidents, stops breathing on table the train, but is revived when Watson administers a shot of adrenaline given to be able to him by Holmes as a wedding gift. Holmes surmises Moriarty's next target is the peace summit in Swiss, where Moriarty will generate an incident between earth leaders to spark warfare.
Holmes, Watson, and Sim are given invitations for the summit by Holmes' pal Mycroft. At the summit, Holmes deduces that a set of twins working for Moriarty in Germany cant be found actually twins. They were the response to an experiment, by the doctor killed on the auction, to give a man the facial skin of another. Watson and Sim get started investigating the guests, realizing then that one is Rene, disguised as an ambassador, and acting as a good assassin. Meanwhile, as they search, Holmes invites Moriarty, who is also present for the summit, to a game of chess on the balcony over a waterfall. Watson and Sim will be able to stop Rene; however, he is surreptitiously wiped out by Colonel Moran. This means that Holmes are not able to prove that Moriarty seemed to be behind the assassination effort, as Rene was really the only loose end that Moriarty acquired left. Following this, Holmes reveals to Moriarty of which in Germany, he stole the account book tracing each one of Moriarty's assets, and replaced it having a duplicate. The account book was the one remaining piece of evidence linking him to their deeds. This book had been delivered to Mary in London (apparently by way of a gypsy courier), who deciphered it by using a key discovered by Holmes even though visiting Moriarty's university office. Mary passes this info to Inspector Lestrade (Eddie Marsan) who begins seizing lots of boxes in Moriarty's company. Holmes then checkmates Moriarty finishing their game.
Holmes, standing at the edge of the balcony, asks Moriarty to gentle his pipe. During this time, each man prepares to try and do battle with the other, and mentally script out the fight inside their respective minds. Both realize that Holmes will eventually lose on account of his shoulder injury. With no other alternative, Holmes blows soot from his pipe in Moriarty's little brown eyes, distracting him. Holmes then grabs Moriarty, pulling him in in close proximity, and Holmes sits within the balcony ledge while bracing his foot on a nearby table. As Watson enters the balcony through the ballroom, Holmes gives him a shorter look then pushes off of the table, throwing Holmes and Moriarty backwards within the edge. The two fall many feet to their apparent deaths on the base of the waterfall. At Holmes' funeral, it is revealed which the bodies of both adult males were never found. Some time later, Watson and Mary prepare to take an a honeymoon to swap the interrupted one, while Watson finishes composing of his last event with Holmes. A delivery of a small oxygen producing apparatus that Watson had seen Holmes borrow from Mycroft alerts Watson that Holmes often have survived. Watson runs from the area to question Mary about the delivery. Holmes reveals himself towards audience, having concealed himself in Watson's room using their urban camouflage suit, before rushing to the typewriter and adding a "? " after the words and phrases "The End", in the writing completed by Watson.