Police: Suspect No.1 - Season 4

With exclusive access to Humberside CID, this series reveals the meticulous work of detectives as they navigate their way through the twists and turns of an investigation, gathering the clues that could ultimately reveal the truth. In Grimsby, a vicious mass street brawl causes mayhem and leaves innocent victims with serious injuries in its wake - one person with a critical head wound. Police initially arrest three men but are then thrown into a desperate race against time to find their accomplices before one of them flees the UK to Romania.

In Scunthorpe, a household is terrorised in their home when five masked men break in and hold them at knifepoint before stealing their car. Detectives face the urgent task of identifying and capturing the suspects before they attack again. At the scene officers uncover crucial pieces of evidence left behind by the attackers - a used vape and a sledgehammer. CCTV footage also captures what appears to be a getaway vehicle - a lead that could provide a vital connection to the masked men. Police arrest their Suspect Number 1, but will he admit his role in the crime and implicate the other members?

A man is viciously attacked on his doorstep with what appears to be a gun. Armed police arrest a gang of four, but it's a race against time to prove they have the right men.

A household is terrorised at home by five masked men who break in and hold them at knifepoint before stealing their car. Can detectives find the violent gang before they strike again?

Like much of the UK, Humberside Police are facing a rise in crimes involving knives and offences weapons. With access to three complex investigations into violent and disturbing crimes, the Humberside CID team reveal the specialist tactics used to identify and apprehend those responsible, by collecting the evidence and confronting their suspect in the interview room. Can the detectives build a case and bring charges against their suspects?

Detectives hunt for a sexual predator after lone females walking in parkland in and around Hull are left traumatised after a man indecently exposes himself in broad daylight, with the only clue the distinctive red bike the man was riding. With the incidents increasing in frequency and more victims left disturbed, detectives mount a large-scale manhunt to find and arrest this dangerous individual before his behaviour escalates into physical sexual violence.