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.

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.