Examining two murders committed in Portsmouth on Dec. 12 of different years by Allan Grimson, and possible links to the disappearance of Simon Parkes.

This episode explores one man's violent rampage through the town of Wrexham, which eventually led to the murder of Nicholas Churton.

In Middlesbrough we look at the story of a man who believed he had committed the perfect murder, and how diligent police work uncovered his identity and his plans for further violent crimes.

This episode looks at Ipswich's 'street drinking' community, a population who live on the streets and often engage in anti-social behaviour and low-level violence, but examines a much more sinister story, ending in three brutal murders and a violent attack.

This is the shocking story of Julie Paterson's tragic murder, and the gruesome details of the attack which shocked the local community and drove her partner to drastic measures.

In Bristol, we hear from the parents of Louise Smith, who woke on Christmas morning 1995 to find their daughter had not returned from a night out the previous evening, as they discuss the events surrounding her disappearance and their desperate need for answers.

When a murder is committed, you hope that the suspect is caught as quickly as possible, but in the case of Elaine Doyle's murder in Greenock, a lack of evidence meant that justice would not be served for several years, until advancements in technology made it possible.

In Nuneaton, we hear from David Freeman, who's younger sister Naomi Smith was tragically murdered on her way to post a letter, as he tells us of the family's quest for answers about who could have done this to her.

Devastated father Keith Vincent retells the story of the sequence of events that led to his son Adam living on the streets of Grimsby, and the circumstances which eventually led to his brutal murder at the hands of a notorious drugs gang.

Airing as a part of domestic violence awareness week - this film tells the dramatic and shocking story of Mario Celaire - a man who viciously assaulted two women he claimed to love.