PC Rogers reveals how he and Alsatian Leo help clear the streets of car thieves, and the officer comes up against a man who threatens to shoot him as the Greater Manchester Police dog squad tackles more criminals. A drunk driver takes on PC Greaves and his sidekick Riley, while spaniel Colin - who is trained to deal with explosives - and PC Carlin are put on the front line when a member of the Cabinet arrives in the city. Ken Stott narrates.