After a vulnerable man is found dead in his bedroom, authorities declare a crime scene and begin an investigation before running into difficulties.

Police find the bodies of two young women in a freezer, possibly lured to their death by the same murderer. Will forensic analysis of the evidence help identify the killer?

Beginning with a body found in a ditch in 2013, a serial killer investigation takes on a new dimension of importance after two more attempted murders are reported.

A motorist discovers a foul-smelling suitcase and calls police, but the corpse within proves difficult to identify until authorities make a breakthrough.

After a 17-year-old is found dead in the family kitchen, authorises’ first lead is a sloppy attempt at clean-up where the murderer has poorly tried to stage the death as suicide.

A boy out on his bike is stabbed by a random stranger with the blade breaking off in his chest, leaving authorities to search for his assailant.

Reports of a riot-level attack bring authorities to South London, only to learn that one victim, an 18-year-old boy, has already died in hospital.

After a 65-year-old woman is found murdered just outside her home, a manhunt for the killer runs into repeated problems with evidence and forensics.

Explores how the police and specialist forensic teams caught Anthony Hardy, one of Britain’s most notorious serial killers, infamously known as “The Camden Ripper.”

Explores how the police and their specialist forensic teams caught evil murderer Stephen Marshall, infamously known as “The Jigsaw Killer.”

The story of Scott Wilkinson, who was found murdered in the River Thames while he was on his annual trip on Donkey Island in Surrey.

In 2002, an 87-year-old pensioner was killed after a man broke into her home and sexually assaulted her, but police were stumped when none of the DNA evidence came back a match.

After a student is found dead in his car, detectives struggle to unravel a sordid, and lethal, family plot surrounding the victim and his girlfriend.

After a student from Poland disappears, authorities soon find the culprit to be a convicted sex offender living under an alias with a long list of victims.

A group of Pakistani men in Glasgow, Scotland, set out for revenge against a Scottish gang by brutally murdering a random white teenager.

After a woman is reported missing police quickly find evidence pointing to her ex-boyfriend, who was out if jail for a brief time around when she vanished.

After a brutally murdered oil rig worker is found in a burnt-out car, the quiet Scottish town soon becomes inflamed with rumours and fear.

A university lecturer’s murder, stabbed to death in a park, marks the start of a killer’s reign of terror as more stabbings follow, with authorities scrambling to keep up.

Dental records show a corpse's identity to be a woman who supposedly died over three years ago from a brain aneurysm.

Police respond to what seems to be a hit-and-run leaving three men critically wounded, but while teams begin to gather evidence one dies in hospital.

Officers from the Metropolitan Police uncover a shallow grave in the back garden of a missing woman, leading detectives on an international manhunt.

Seventeen-year-old Jodie Chesney was stabbed in the back while hanging out with friends in the local park. An obscure clip of CCTV helped to catch her killers.

A small north Wales community is in fear after the ritualistic murder of an elderly woman. Police are convinced the killer is a local. Forensic evidence mounts, and the net closes in.

A loving mother is brutally attacked in the street during the evening rush hour. The police's prime suspect has a watertight alibi, so it's up to the forensics to uncover the truth.

After church organist Alan Greaves dies following a suspected hit and run, forensic experts find a clue on his body that unlocks the truth of the case.