At 4.30am on a Saturday, Bedfordshire Police are called to Dunstable Town Centre, where a man has driven a car into a group of revellers outside a kebab shop before fleeing on foot. His victim has been left unconscious with life-threatening injuries and the police's only lead is the car. With a suspect on the loose, cameras follow every twist and turn of the investigation, as the urgent job of tracking him down is handed to the Criminal Investigation Department.