Guy Ritchie Executive-Produced ‘Young Sherlock’ Maps a Multi-Season Rift Between Holmes and Moriarty
Executive produced by guy ritchie, the new Prime Video series Young Sherlock reimagines Arthur Conan Doyle’s detective as an anarchic 19-year-old and sets up a multi-season plan to turn an early friendship with James Moriarty into a legendary rivalry.
The first season is eight episodes long and follows Sherlock, played by Hero Fiennes Tiffin, after he is wrongfully indicted for the murder of an Oxford professor. He joins forces with his one close companion, James Moriarty (Dónal Finn), to uncover an international conspiracy that leads back to Sherlock’s absentee father, Silas. Midseason viewers learn that Silas, played by Joseph Fiennes, is a power-hungry businessman pursuing a deadly chemical agent as part of a plan to revolutionize warfare.
Guy Ritchie returns to the Sherlock world
Guy Ritchie returns here as an executive producer; he had previously directed Robert Downey Jr. in two Sherlock Holmes films. Showrunner Matthew Parkhill said he deliberately avoided adapting later canon material, keeping the story in the period before and around 'A Study in Scarlet' to give the writers creative space for a new origin story for Holmes.
How Young Sherlock makes Holmes and Moriarty friends
Parkhill frames the season around an unlikely friendship that unravels: Sherlock is 19 during the events, and the relationship with Moriarty is presented as the emotional and narrative engine of the series. Hero Fiennes Tiffin auditioned while on vacation in Thailand and did chemistry reads with several actors considered for Moriarty; Dónal Finn was one of the last tapes Parkhill watched and was singled out for his magnetism, intensity and charm. The showrunner described the pairing as two sides of the same coin and plans to explore why one character chooses one path and the other chooses another.
Fiennes family casting and the plan beyond season one
The season also leans on intergenerational casting: Silas is played by Joseph Fiennes, who is Hero Fiennes Tiffin’s maternal uncle, a choice Parkhill said helped craft the father-son dynamic. Parkhill has already mapped out a multi-season arc that will pit Holmes against Moriarty further, though the series has not yet received a formal pick-up beyond its eight-episode launch.
The eight-part first season is now streaming on Prime Video, and the creative team has signaled that further storytelling will depend on whether the show is renewed to carry the planned multi-season conflict forward.
