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 by a dog-walker in 2013, a serial killer investigation takes on a new dimension of importance after two more attempted murders are reported.
When a carer finds a vulnerable man dead in his bedroom surrounded by blood splatter, authorities declare a crime scene and begin an investigation but run into difficulties as they are confronted by clear signs of a thorough clean-up.
When a motorist finds a foul-smelling suitcase they call the police. But the corpse within proves difficult to identify until the authorities make a breakthrough.
After a 17-year-old is found dead in the kitchen of her own home, the forensic team's first lead is that there has been a sloppy attempt at clean-up where the murderer has poorly tried to stage the death as suicide.
Police officers respond to reports of violent disorder in a south London residential street involving a large group wielding axes, knives and lumps of wood, attacking cars and people.
Only yards away from her home in Rochdale, 65-year-old Eileen Jawczak is found brutally murdered. But despite an extensive forensic recovery, CSIs cannot uncover any promising leads.
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 respond.
