A boy survives being stabbed in the heart by a stranger. While surgeons try to remove the broken blade, detectives analyse CCTV footage and search for witnesses to the attack.

A landlord discovers a foot poking out of his wheelie bin, outside a property that has just received an end-of-tenancy deep-clean that may have destroyed any evidence.

A university lecturer is found stabbed to death in the middle of a park. Just moments later, a report comes in of a second non-fatal stabbing, less than a mile away.

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.

Only yards away from her Rochdale home, 65-year-old Eileen Jawczak is found brutally murdered. But despite an extensive forensic recovery, CSIs cannot uncover any promising leads.

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.

Forensic teams investigate the murder of a teenage girl in her own home, and discover that the killer has attempted to cover their tracks by making it look like suicide.

A decomposing human corpse is found in a suitcase dumped on a country lane in Yorkshire. The investigation's first clue is the distinctively patterned tape used to bind the victim.

A carer discovers a vulnerable man dead in his bedroom, surrounded by blood spatter. CSIs immediately search for evidence, but are confronted with signs of a thorough clean-up.

A body found in a ditch by a dog walker in 2013 became the first in a series of dead bodies discovered, kick-starting a police investigation to track down a serial killer.