A car sale on social media turns into a knife-point carjacking and a high-speed car chase.

A supermarket row explodes into violence. And detectives race to catch a dangerous gang.

The investigation into a spree of violent attacks - a stabbing, an attempted robbery and an assault - that all took place in a single morning in Peterborough. Plus, how the death of a young woman in a car crash in south Wales led police into an inquiry into alcohol and drugs.

When a man fatally stabs a suspected thief outside his Suffolk home, detectives must untangle whether it was self-defence or something much darker. In Hertfordshire, a woman's car is found engulfed in flames and police records show she has been reported for drug dealing. Officers uncover a chilling pattern of stalking, deceit and control that leads back to her ex-boyfriend, who is already under a protection order. But who is telling the truth?