David S. Goyer and cast members Tom Riley, Blake Ritson and Eros Vlahos discuss Da Vinci's Demons. Following the untold story of genius Leonardo Da Vinci during his early years, the final season sees the artist, inventor and swordsman confronted with an Ottoman invasion, betrayal, a Roman Crusade and a series of grisly murders. Hosted by Boyd Hilton at the Apple Store, Covent Garden in London.