TMDb/Young Sherlock TV Young Sherlock returns! Hero Fiennes Tiffin stars as the teen detective in Season 2, with Guy Ritchie back to direct. Stream the hit Prime Video series. April 15, 2026 AceShowbiz - Prime Video has officially renewed the detective drama Young Sherlock for a second season, continuing the story of a teenage Sherlock Holmes. The series, which stars Hero Fiennes Tiffin as the young detective, originally debuted on March 4 with all episodes released for binge-watching.