Two years after the Reichenbach fall, John H. Watson's life seems to be gradually returning to peace.He works hard to leave the shadows of the past behind, and plans to enter a new stage of life with Mary Morstan, who combines beauty and wisdom.However, just when they were about to enjoy this harmony and romance, the resurrection of Sherlock Holmes broke the tranquility.

Watson is both happy and full of complicated emotions about Holmes' return.He knew very well that the appearance of this old friend meant that they would be involved in a series of complex cases and dangerous adventures.However, he could not deny that deep down he was full of expectations for Holmes' return.

This time, Sherlock and Watson's journey will be full of challenges.They need to uncover the conspiracy hidden under the streets of London, solve the sudden accident at the wedding, and at the same time face a notorious and insidious enemy-Charles Augustus Magnussen.Magnussen is known for his cunning and cruel methods, and his presence adds more complexity and uncertainty to the entire case.

In the process of solving these challenges, Sherlock and Watson's relationship also experienced tremendous changes.The tacit understanding and trust they once had had cracks due to Holmes' resurrection.Watson is confused and disturbed by Holmes' return, while Holmes attempts to reintegrate into their lives in his own way.

In one of Anderson's boldest imaginings, Sherlock Holmes's %death is portrayed as an elaborate hoax involving masks and the mysterious powers of a hypnotist.However, this compelling theory was ruthlessly dismissed by Inspector Lestrade, who believed that it was simply Anderson's guilt over Sherlock's suicide due to a misunderstanding.However, this is not the case.

During the period when Shylock's life or death was uncertain, his brother Mycroft personally went deep into Serbia and rescued Shylock from the brutal forced confession.Sherlock is told that London's underground network is planning a series of terrorist activities, and he must return immediately to expose and stop these conspiracies.As a result, Sherlock returned to 221B Baker Street with a new identity and determination.

After receiving the news of Sherlock's return, Dr. Watson once again stepped into this place full of memories with mixed emotions.He met Mrs. Hudson. Due to the shock of Sherlock's suicide, Watson still can't let go and even avoids using mobile phones to contact friends.Mrs. Hudson was both happy and sad about Watson's arrival, and Watson also revealed the good news to her that he was about to get married, insisting that he and Sherlock were not in a relationship.

Mycroft decided not to tell Watson Sherlock's true situation for the time being, and even Mrs. Hudson knew nothing about it.Sherlock planned to surprise Watson, so he pretended to be a waiter and appeared in the restaurant where Watson proposed.However, his prank made Watson furious, and the two clashed again.Although Sherlock explained the reasons for his disappearance and concealment of the truth, Watson still found it difficult to accept and rejected Sherlock's invitation to solve the case together.

Having lost his assistant, Sherlock had to find a new one, and Jasmine became his new assistant.However, at this moment, Watson decided to shave off his beard because of Sherlock and Mary's ridicule.However, Jasmine's love affair puts Sherlock into trouble again.

After solving a series of difficult cases, Sherlock began to deal with terrorist attacks in London's underground network.However, while he was going all out, Watson was kidnapped.Sherlock rode his motorcycle and took Mary to the Bonfire Festival and successfully rescued Watson.During the investigation, they discovered a clue provided by a staff member on the train and followed the clues to reveal the conspiracy of the subway case.

In an abandoned subway tunnel, Sherlock and Watson discovered a large number of bombs.However, at this moment, the bomb was activated remotely.Although Sherlock claimed that he could not defuse bombs, his ingenuity successfully prevented the bomb from exploding and prevented Big Ben and members of Congress from being attacked.

Sherlock found Anderson and explained to him his original plan to successfully escape.Although Anderson remains skeptical, Sherlock's determination and intelligence have won him over.The murderer of the subway case was arrested, but Sherlock knew there was a bigger conspiracy behind it.He plans to continue his in-depth investigation to uncover the truth of all this.

In the original work - The Sign of Four -, after a year of pursuit, Inspector Lestrade is finally on the verge of capturing the cunning criminal.However, at this critical moment, a text message from Sherlock Holmes disrupted his plan.The simple two words “HELP” in the text message forced Lestrade to give up the credit at hand and hurriedly returned to 221B Baker Street.

He thought Sherlock had encountered some kind of life-threatening danger, but the truth made people laugh and cry.It turns out that Sherlock is worried about Watson's wedding.Watson invites Sherlock to be his best man and give a speech at the wedding.For Sherlock, a detective known for his logical thinking, this is undoubtedly a huge challenge.

Mrs. Hudson brings morning tea and comforts Sherlock by saying that marriage can completely change a person.However, this only made Sherlock feel worse.He worries that his inappropriate words will ruin Watson and Mary's happy moment.In order to distract Sherlock, Mary suggested that Watson find him some cases to solve.

The wedding goes as planned, and the bridesmaid tries to flirt with Sherlock, but he remains unmoved.At this time, a man named David appeared, which made Mary very happy.However, David did not dare to approach Mary.It turns out that Sherlock had already investigated David and warned him not to have any love for Mary. If they meet, it must be in the presence of Watson.David was alarmed.

At the wedding, Watson's old boss Colonel Sholto appeared, which surprised Watson.And when Sherlock began to address the best man, his sincere words and sincere emotions moved everyone present.Sherlock was invited to the wedding by Watson and was called one of the two people he loved most in his life and his best friend.Sherlock was so shocked by this discovery that he was almost speechless.

At the wedding, Sherlock begins telling interesting stories about Watson, most of which relate to their experiences solving crimes together.In these cases, Watson demonstrated his bravery, determination and loyalty.Especially in the case of the mysterious death of the Queen's Guardsman, Watson's professionalism as a military doctor left a deep impression on Sherlock.In the ghost date case, Sherlock and Watson spent Watson's bachelor's night together. The two got drunk on the street and were eventually fished out of prison by Lestrade.

At the climax of the wedding, Sherlock suddenly realized the connection between the two cases.Someone wants to assassinate Watson's boss at the wedding.He acted quickly and used his wit and decisiveness to stop the assassination and ensure that the wedding went smoothly.

Watson and Mary danced to the sound of Sherlock's beautiful violin, and Jasmine happily embraced her boyfriend.The dance continued after the wedding, and the guests were laughing and lively.However, Sherlock chose to leave alone at this moment, put on his coat and disappeared into the night.

In a corner of London, Watson received an anxious call from a friend, asking him to go to a gathering place for young people to take drugs to find his missing son.Without thinking much, Watson embarked on this unknown journey.However, he never expected that this simple search mission would lead him once again into the complex world of Sherlock.

When Watson stepped into that dark corner, the sight in front of him made him frown.And when he saw that familiar figure, Sherlock, addicted to the world of drugs, his heart sank to the bottom.For a case, Sherlock started taking drugs again, which he had given up long ago, which made his brother Mycroft very angry.But Sherlock insists that he did it to solve the case and that drugs can bring him inspiration.

Watson didn't say much, he just silently took Sherlock back to Baker Street.However, when he opened the door, he was surprised to find that Sherlock had a new girlfriend, and this girlfriend was Jie Lin, the bridesmaid at his wedding.Watson's heart was full of mixed feelings. He didn't know whether the relationship between Sherlock and Jie Lin was for the case, or whether it was true emotion.

In the days that followed, Sherlock and Watson investigated the case together.In order to get closer to his target, Sherlock even pretended to propose and sneaked into Magnuson's office.Watson follows closely behind, and together they explore the truth.However, just when Sherlock discovered that Magnussen was being threatened, the threatener turned around and turned out to be Watson's new wife Mary.Mary used to be a government agent. After getting tired of the life of licking blood with a knife, she chose to live in seclusion and marry Watson.But now, her identity was accidentally revealed by Sherlock. She originally wanted to kill Sherlock, but in the end she only wounded Sherlock out of compassion.

Sherlock used all his knowledge to protect himself and survived despite serious injuries.Watson learned Mary's identity from the sober Sherlock, but he chose to forgive Mary.However, things are not that simple.Mary's information was held by Magnussen and used to threaten the other party.In addition, Magnuson also possesses a lot of secret information, which is used to threaten various countries in the West, and even Mycroft has been threatened.

In order to protect the interests of Mary and the country, Sherlock and Watson found Magnuson again.But Magnussen was an excellent criminal with an excellent memory.Sherlock thought the other party had a secret warehouse to store threatening information, but eventually discovered that the information only existed in Magnuson's memory palace.In order to protect Mary's identity from being discovered, and to protect the interests of Mycroft and the country, Sherlock resolutely shot and killed Magnussen in front of the police, and he was convicted.

In order to protect his younger brother, Mycroft had no choice but to send Sherlock abroad, to Eastern Europe to work as an undercover agent for half a year.Watson and Mary sent Sherlock away, their hearts filled with reluctance and worry.However, just after Sherlock left, Moriarty's video was played on electronic screens across the country.It turns out that Moriarty was not killed in the original fall case, and everything was shrouded in mystery.

In order to expose the truth about Moriarty's survival, Sherlock was recalled to London again by Mycroft.He once again stepped into this city full of mysteries, ready to uncover the final truth.And Watson and Mary will also be by his side, accompanying him through this unknown journey.