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.