The Moment of Proof

West Midlands Police are facing a massive spate of burglaries, and they know one man is responsible for them all. But they just can't catch him in the act. However quickly police arrive, the intruder seems to have vanished into thin air. The break-ins continue unabated - one of the detectives even gets burgled himself! But a single piece of crucial information from a police informant finally gives officers the upper hand. Also, the National Crime Agency is alerted to a plumber who's buying gun-making equipment online. Could there be an innocent explanation, or is something unusual going on in his lock-up?