You don't need me tell you that the first hour of emergency care after a life threatening incident is crucial, but just who are the doctors behind these life-or-death decisions that have to be made? And how exactly do they even make them in the first place? A new series of this show kicks off tonight, which follows the stories of patients from the very moment the 999 call is made. In this first episode, young cyclist Janina is in cardiac arrest following an accident, doctors attempt to stop Tony from bleeding to death, and 11-year-old Blake is left with a serious head injury after being hit by a car.