Wikimedia Commons/Young Sherlock TV series TV Young Sherlock debuts on Prime Video with a 100% RT score, following a young Holmes framed for murder with Moriarty as his unlikely ally. April 25, 2026 AceShowbiz - Young Sherlock is making a strong debut on Prime Video as the new prequel series explores the early life of Sherlock Holmes, portrayed by Hero Fiennes Tiffin. The show follows a young and unrefined Sherlock who finds himself falsely accused of a murder at Oxford University.