Quinnan is assaulted during the arrest of a bag snatcher, but an intrusive passer-by begins to make the situation worse. Quinnan, however, is unaware that the man is none other than the new Ch. Insp of Ops at Barton Street. Cato has a kind word in the Ch. Insp's ear about his lack of professionalism, but his abrasive style of management leads to a confrontation with Brownlow.