After reading from the wedding telegrams, Sherlock expresses his deep love and respect for John and launches into a rambling narrative, describing John's role in an attempted murder case, "the Bloody Guardsman" a Guardsman named Bainbridge ( Alfred Enoch) contacted Sherlock, fearing he was being stalked. Sherlock rises to give the best man speech, but he initially hesitates. Hudson's suggestion that John and Mary's marriage will change his life. Sherlock calls Mycroft ( Mark Gatiss), who repeats Mrs. Sholto (the name is a reference to a character in The Sign of Four) lives in seclusion, having received death threats and media scrutiny after losing a unit of new soldiers in Afghanistan. At the reception, John is delighted to see Major James Sholto ( Alistair Petrie), his former Army CO. Hudson ( Una Stubbs) reminds Sherlock that marriage changes people.
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However, when Lestrade receives a text for help from Sherlock, he abandons the case and races to Baker Street, assuming the worst and calling for full backup – only to discover that Sherlock is simply struggling to write a best man speech for John's upcoming wedding to Mary Morstan ( Amanda Abbington). In the opening scene, DI Lestrade ( Rupert Graves) and Sergeant Donovan ( Vinette Robinson) are on the verge of arresting the criminal Waters family that has evaded the police several times. It garnered a viewership of 11.37 million, and received mostly positive reviews. It is set six months after the series opener " The Empty Hearse" and is primarily centred on the day of Watson's wedding to Mary Morstan. The episode's title is inspired by The Sign of the Four by Sir Arthur Conan Doyle. It was written by Stephen Thompson, Mark Gatiss and Steven Moffat and stars Benedict Cumberbatch as Sherlock Holmes and Martin Freeman as Dr John Watson. " The Sign of Three" is the second episode of the third series of the BBC television series Sherlock.