Quinnan and Hollis have to decide whether a pub quiz champion is breaking the rules. Skase deals with the unfaithful wife of a local villain.

Page is shocked when a man shows up at the front desk armed with a gun, claiming to have shot a man and left him for dead.

Meadows is approached by DCI Calder of Barton Street, who was a DC of Meadows at AMIP. Calder admits while he is on the verge of promotion to Superintendent, an armed robbery that went wrong has left him under the kosh. With a suspect vanishing right before the job, Calder claims CIB are investigating a theory that one of the Barton Street CID team tipped the gang off, but Meadows is skeptical and leaves Calder to it. Coincidentally, Calder's elusive suspect is found as the victim of a beating attended by Garfield and Stamp, with a member of the public attempting to help savagely assaulted as a result. Beech identifies one of the men fleeing the scene as DC Bonford of Barton Street, proving they have found their inside man. However, the discovery may come too late as Calder is found atop of a high-rise tower block intent on committing suicide. Can Meadows and Conway talk him down?