The conclusion of a two-part special taking viewers behind the scenes of a police investigation into the death of an 11-week-old baby. Both the mother and her partner are under suspicion of inflicting injuries on the child on a similar scale to those suffered in the notorious case of Baby P, but neither is yet in custody. DI Lucy Thomson of Cambridgeshire's Major Crime Unit, who leads the investigation, has decided she isn't ready to show her hand. However, when police receive a 999 call reporting a disturbance at the couple's flat they rush to the scene and the investigation takes a dramatic turn.

The first episode of a two-part special taking viewers behind the scenes of a Major Crime Unit investigation into the death of an 11-week-old baby after 11 days in intensive care. During this time, the police are watching the parents intently for fear they may have harmed the child - concerns that seem to be borne out when the scale of the child's injuries is revealed by an autopsy.

The real-life drama follows police investigations into one of the most disturbing and hard-to-prove crimes - baby-shaking cases - and examines parents' often-divided loyalties.

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

Bedfordshire Police's largest ever operation into historic abuse continues, with DS Rachael Foy spending three years working to persuade victims to testify against the suspect. However, she knows that the system too often lets victims down even when they are brave enough to come forward - and in this case, many of the victims have died before they are able to do so.

Part one of a two-part report into the case of a man who sexually preyed on young people in Luton, which eventually became Bedfordshire Police's largest ever operation into historic abuse. The film begins with the work of a detective in the Child Sexual Exploitation unit, who discovers that a victim's testimony identifies a man who had been arrested eight times previously for sexual offences but had never been convicted.

A violent daytime brawl with knives erupts on the streets of Luton as a chicken shop war heats up. But the case takes an even more disturbing twist when a police raid lands a huge cache of drugs.

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.