999: What's Your Emergency?

Police launch a murder investigation when two people are stabbed by a stranger. But all may not be as it seems, in a case that raises difficult questions about why people carry knives.

One-off special following South Yorkshire Police investigating reports of bullying, from playground brawls and racism in schools, to coercive domestic abuse. Cases featured include a 14-year-old boy hospitalised by a gang in the street, a single vulnerable woman being systematically targeted by local teens in her own home, and a distraught mother watching her 27-year-old son attempting suicide after being bullied at work.