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?

16-year-old Joshua Davies was sentenced to 14 years in jail for the murder of his on-off girlfriend, Rebecca Aylward. Why did kill - and only confess to it in prison?

Teen 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?

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?

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

A clever child from a loving home, William Cornick shocked Britain when he stabbed to death his teacher, Anne Maguire, in 2014. What caused his pathological hatred?