Young Sherlock, a British mystery television series, will see Hero Fiennes Tiffin return as the titular character. A Georgian Square in Bristol is being transformed back to the Victorian era 'Oxford' ahead of the filming of the second series. Portland Square in Bristol has been transformed for the filming for season 2 of Amazon's Young Sherlock. (Image: Tom Wren / SWNS)The series, first aired in March this year, is inspired by Andrew Lane's Young Sherlock Holmes book series. Young Sherlock received praise upon its release, and its 84% rating on Rotten Tomatoes reflects that.