The return of the documentary following the work of emergency services, with this edition focusing on the decline of the Great British high street and looking at how the nation's town centres are becoming hotbeds of antisocial behaviour, crime and violence. In Northamptonshire, PCs Louise O'Sullivan and Sean Whelan attend a call from a distraught homeless man, who has taken refuge in a shop after being threatened with a knife.

With police resources stretched to breaking point in Northamptonshire, this episode looks at the increasingly violent behaviour of teenage boys, from acid attacks to stabbings