Another gripping true crime documentary featuring unprecedented access behind the scenes as police investigate a major crime.

It's Saturday night in Luton, and a man is fighting for his life after being shot at point blank range in the chest with a handgun.

The attack appears to be a completely unprovoked shooting of a stranger.

With a gunman on the loose, the police launch a frantic operation to find the identity of the suspect. DC Colin Knight of Bedfordshire Police's Guns & Gangs unit admits the pressure: 'We have a very dangerous person out there willing to shoot innocent members of the public.

The ultimate fear would be if he's done it once he can do it again...

A young woman walks into Luton police station and tells detectives she too has been threatened by the man.

The young woman, says:

"He caught me by my throat, and put the gun against my head and asked me whether if I was a wolverine or wolf."

Cameras follow every twist and turn of the manhunt as detectives gather evidence to work out what really lies behind the attempted murder of an innocent man, as they try to catch the shooter before he strikes again.

This is real-life drama where the facts really do turn out to be stranger than fiction.

The UK's biggest and most successful true crime documentary series returns with the first of four gripping new films that take viewers behind the scenes of police investigations into major crimes.

In Bedfordshire, a 23-year-old man is under arrest, but this isn't his first time in custody.

In fact, he claims he has been held by the police many hundreds of times before.

He is accused of committing a string of crimes where his victims have been left badly hurt.

In his interview he simply answers "no comment".

Without fresh evidence, officers have no choice but to release the suspect.

DS Claire Gilbert of Bedfordshire Police can't hide her frustration; she believes he will offend again.

DS Gilbert, says:

"If you are never left to account for what you do, then that breeds a belief that 'I am invincible'."

Within days of leaving police custody, the man is named by the public in reports of a fresh crime wave, which this time culminates in a sex attack on a young woman.

On the run and apparently out of control, the suspect is now officially 'Most Wanted'.

Cameras follow as armed officers are deployed to find and arrest him.

Every twist and turn of the case is recorded as DS Gilbert and her team piece together enough evidence to convict a suspect she regards as a danger to the public.

This is real-life drama where the facts turn out to more compelling than fiction.