Paramedics are called to a body in the bedroom of a Birmingham house and when they discover blood and signs of violence in other parts of the house, police launch a murder investigation. The victim is found to have suffered a brutal attack with more than 100 injuries and died from trauma to the head. With a violent killer on the loose, detectives launch door-to-door inquiries and soon learn about a man who asked some else to call for an ambulance. Could he be a key witness - or the chief suspect?