Presented by Rav Wilding, the show commemorates brave police officers murdered in the line of duty. The series tells the stories of the most high-profile police murders of the past 50 years, including the infamous Shepherd's Bush murders, Dale Cregan's murder of PC Nicola Hughes and PC Fiona Bones and the murder of PC Ian Broadhurst. Combining first-hand accounts and expert analysis, viewers are given real background and insight into the role of the police officer and how the thin blue line they walk often leads them into danger.