Stories of ordinary people doing extraordinary things to keep Australia safe. The impact of homicide and other violent crimes on those who come face to face with it cannot be measured. Whether it's the paramedic who is first on the scene, or the police and other professionals who deal with death as part of their daily work, the burden they endure is something most of us could not comprehend. Impact chronicles the working lives of police, paramedics, doctors and forensic experts. It offers a rare insight into the personal cost of their jobs - from alcohol abuse and PTSD to mental and physical health issues and relationship problems. Their stories are raw, honest accounts of cases they attended or investigated and the emotional toll of dealing with trauma. Impact is a powerful and visceral look, through the eyes of these front-line professionals, at the ripple effect of murder and violence on society.