Premiere. Sir Trevor McDonald presents this ground-breaking film, which features unprecedented access to the work of Northumbria Police murder detectives as they try to catch the killer of Alice Ruggles, a 24-year-old woman from Gateshead. From the moment the body is discovered by her flatmate, viewers see first-hand exactly how the investigation unfolds throughout 'the golden hour', the initial period of the investigation when every decision made by the senior investigating officer can be the difference between whether or not the murderer is caught and convicted.