A clever child from a loving home, William Cornick shocked Britain when he stabbed his teacher, Ann Maguire, to death at his school in Leeds. This documentary explores the possible causes of his pathological hatred.

In 2009, Rosalyn Hunt and Desmond Thorpe were murdered by teenager Lorraine Thorpe and her accomplice. Was Britain's youngest double female killer always destined to kill?

15-year-old James Fairweather terrorised a local community with random deadly attacks that left two people dead. What made him carry out such brutal murders?

Teenage lovers Kim Edwards and Lucas Markham were convicted of murdering her mum, Elizabeth and younger sister, Katie in April 2016. What led them to kill?

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In 2013, Sean McHugh, went to a laundrette in Anfield, Liverpool to do his washing, only to be stabbed by a teenage gang. What made them kill an innocent man?

In Wiltshire, 17-year-old Ellie Gould was attacked and murdered by her ex-boyfriend. Ellie's parents and friends speak about the tragedy.

The case of 20-year-old Sophie Lancaster, who was attacked and brutally beaten by a gang of teenagers. Sophie's mother and friends talk about the tragic events.

A 17-year-old girl was out with friends in an East London park when she was stabbed by unknown assailants. Fatally, it was a case of mistaken identity.

When a 15-year-old boy was lured to a Liverpool park, tortured and left for dead, it was dubbed the 'Reservoir Dogs' murder. His three killers were 15.

18-year-old Josh Taylor was killed after a petty argument turned deadly. Josh's sister and father speak about the tragic events of that night.

18-year-old mum Samantha Madgin was brutally stabbed to death on a night out. Her mother and friends provide details of that horrific night.

In Liverpool, 11-year-old Rhys Jones was shot dead as he walked home from football practice. His dad and his football coach discuss this tragic story

The Murder Of Lindsay Birbeck. Mother-of-two Lindsay Birbeck's body was found in a quiet corner of a graveyard. Her family and ex-partner speak out about this devastating murder.

Eighteen-year-old Liam Gray was attacked and stabbed through the heart by one of his friends. His mum and sisters speak out about the tragedy for the first time.

16-year-old Megan McAlorum's body was discovered after a night out with friends in Belfast. Her family and best friend discuss the tragic incident.

On the 17th of October 2017, 15-year-old Kyron Webb was stabbed in a brutal and unprovoked attack - three days later he died in hospital. 17-year-old Michael Idehen was convicted of his murder.

Christopher Folkes was crossing the park on the way to his mother's house when he was attacked by a stranger. His family speak out about his murder.