Colin Firth Joins 'Young Sherlock' Series Opposite Hero Fiennes Tiffin

Colin Firth has joined the cast of the upcoming Prime Video series Young Sherlock! Hero Fiennes Tiffin, best known for his work in the After movie franchise, is playing the title role in the new series based on Andy Lane‘s novels. Also starring in the series are Hero‘s real-life uncle Joseph Fiennes, as well as