

This episode features the case of two 15-year-olds who carried out a vicious hate crime.

A gang of 20 high-achieving students attacked 15-year-old Sofyen Belamouadden with Samurai swords and kitchen knives in front of horrified rush hour commuters, leading to what is believed to be the largest joint enterprise murder investigation in British legal history.

Stuart Harling was obsessed with an ultra-violent video game, and in 2006 he stabbed nurse Cheryl Moss 70 times. Steven Miles watched nothing but 'Dexter', and in 2014 he dismembered his girlfriend. Aaron Roach Bridgeman speaks to family members, barrister, journalists and experts who were associated with the cases.

17-year-old Marcel Addai was cruelly chased down and murdered by members of a rival gang after an ongoing rap video feud.