A man is viciously attacked on his doorstep with what appears to be a gun. Armed police arrest a gang of four, but it's a race against time to prove they have the right men.

Like much of the UK, Humberside Police are facing a rise in crimes involving knives and offences weapons. With access to three complex investigations into violent and disturbing crimes, the Humberside CID team reveal the specialist tactics used to identify and apprehend those responsible, by collecting the evidence and confronting their suspect in the interview room. Can the detectives build a case and bring charges against their suspects?