Elementary 7x04 "Red Light, Green Light" Season 7 Episode 4 Promo Trailer - An explosion at a traffic stop puts Holmes and Watson on two separate tracks of investigation as they try to determine whether the attack was gang-related or a terrorist attack. Also, Holmes and Watson suspect there is more for them to discover regarding the recent attack on someone within their inner circle, on ELEMENTARY, Thursday, June 13th on CBS. Jonny Lee Miller directed the episode.