In this new heart-stopping police series, we follow one of Britain's top homicide teams as a series of horrific and violent murder investigations unfold. With extraordinary access throughout each case, the series draws the viewer into the dark heart of murder investigations as the hours and minutes tick away. Can the detectives unravel what happened and who was responsible, will the police manage to confront their Murder Suspect No.1 in interview and present their evidence? And will they get the charges to stick before the suspect strikes again?