Murder: Suspect No 1

In Hull, a vulnerable man is violently attacked in his own home and left for dead after his assailant sets fire to his flat. Emergency services rush to the scene, and firefighters pull the 54-year-old man from the inferno. The victim is in a critical condition and shows obvious signs of assault. With his life hanging in the balance, the case is escalated to Humberside Major Crime's Team. CCTV identifies a suspect arriving at the crime scene and leaving just before a passerby spots flames and smoke billowing from the same flat. During the ensuing search for the suspect, investigators uncover an audio recording where a voice, believed to be the attacker, taunts, 'enjoy the fire'. But who is the perpetrator, where is he, and what drove him to kill?

Documentary following homicide investigations, beginning in Lancashire with the case of a man brutally beaten to death in a basement squat in the early hours of the morning. A person acting suspiciously is arrested close to the scene, but claims they are also the victim of an assault. With their only suspect denying any involvement, can detectives separate the truth from the lies and prove beyond reasonable doubt they have the right person?

The case of a man walking along the hard shoulder of the M40 who confessed to a murder, and the discovery of a woman found dead at her home in Havant. Detectives were pushed to prove what had happened when their suspect refused to talk. He offered no account of what occurred and whether his roadside confession could be used in court came into question.