Young Sherlock Star Shares Henry Cavill’s One Rule for Playing Holmes

Before donning the deerstalker for Young Sherlock, Hero Fiennes Tiffin turned to former Holmes Henry Cavill for guidance — and says one sharp tip became the compass for his take on the legendary detective.

Before stepping into Sherlock Holmes for Guy Ritchie, Hero Fiennes Tiffin did the sensible thing: he called another modern Sherlock. Specifically, Henry Cavill. It is a neat little handoff between Holmeses, and the advice Cavill gave him is exactly the sort of clean, no-frills mantra you want in your head before playing the smartest guy in any room.

The Cavill check-in

At the world premiere of Young Sherlock in London, Fiennes Tiffin said he reached out to Cavill ahead of filming. The two worked together on The Ministry of Ungentlemanly Warfare, where Fiennes Tiffin had a smaller role, and Cavill has a long-running rapport with Ritchie. Oh, and Cavill already wore the mantle in Enola Holmes and its sequel, so he knows the territory.

'A man who worries before it's necessary, worries more than necessary.'

As Fiennes Tiffin put it: 'I did reach out to him before we started filming.' Simple, practical guidance — and not a bad reset button for a young Sherlock series finding its own lane.

Premiere night and what's next

Prime Video threw the world premiere at Queen Elizabeth Hall and dressed up London's Southbank Centre as 221B Baker Street for the night — a very Ritchie move. Ritchie and the cast turned out, and the series positions itself as a high-energy origin story for Sir Arthur Conan Doyle's detective, zeroing in on his younger years with Fiennes Tiffin in the title role.

• Young Sherlock is directed by Guy Ritchie and stars Hero Fiennes Tiffin.
• Prime Video will release all eight episodes globally on March 4.
• The show explores Sherlock Holmes' backstory during his youth.
• Fiennes Tiffin previously worked with Cavill (and Ritchie) on The Ministry of Ungentlemanly Warfare; Cavill also played Sherlock in Enola Holmes and Enola Holmes 2.
• The London premiere took over Queen Elizabeth Hall, with the Southbank Centre transformed into a 221B Baker Street set piece.

We will see if Cavill's don't-worry-twice rule threads through the character. Either way, it's a sharp baton pass between two Holmeses — and the kind of behind-the-scenes pep talk that actually tracks once the deductions start flying.