Series 9

Police officers search for a man in Luton who disguises himself as a delivery driver to force his way into people's homes and commit brutal assaults. However, when the police investigation fails to make headway, the family of one of the victims launch a campaign for information on social media - which increases the likelihood of the criminal seeing he is at risk of discovery and going to ground.

A violent daytime brawl with knives erupts on the streets of Luton as chicken hop war heats up. The case then takes a disturbing twist when a police raid lands a huge cache of drugs.

A lone detective is on the trail of a Luton man who sexually abused scores of young people, in what becomes a very complex and disturbing pursuit.

In the gripping conclusion to this two-part special, the victims of historic child sex abuse come forward to try and finally get justice, and prevent the suspect from walking free for the ninth time.

On a quiet Sunday lunchtime in a Cambridgeshire suburb, a man lies bleeding to death on the doorstep. A major manhunt is triggered, where the strength of family blood ties is brutally exposed.

Features police investigations into one of the most disturbing and hard-to-prove crimes, baby-shaking cases, and examines parents' often-divided loyalties. Detectives probe the stories of the parents, as they piece together what really happened