- Previous episode S07E03 - The Price of Admission
- Number S07E04
- Director Jonny Lee Miller
- Writer Robert Hewitt Wolfe
Red Light, Green Light
An explosion at a traffic stop puts Sherlock and Joan on two separate tracks of investigation as they try to determine whether the attack was gang-related or a terrorist attack. Sherlock and Joan suspect there is more for them to discover regarding the recent attack on someone within their inner circle.