DCI Meadows and DC Skase are furious when PC Jim Carver turns up drunk to give evidence in a court case - evidence which is so unreliable the judge throws the case out of court. As his colleagues begin to realise the extent of Carver's problems, Insp. Monroe decides to put him on an easy task - escorting a convoy of confiscated drugs to a Home Office depot for destruction. As Carver enjoys a sly drink with depot floorman Vernon Liggett, he accidentally mentions the convoy's destination. The next day, he and Stamp drop behind as Carver dashes out to be sick. When they catch up, the convoy is under attack from four armed men. With little regard for his own safety, Carver dashes forward and tackles one of the men, who abandon their assault, although an SO19 officer is shot during the raid. Despite his heroics that day, Carver is in trouble for breaking procedure, and it could be far worse as there could be an inquiry into how the convoy route was known.

DCI Scanlon from Kent Constabulary arrives to investigate the attack on the Home Office convoy. PC Jim Carver pays Vernon Liggett a visit, but he denies any involvment. Scanlon and Meadows interview the warehouse staff, with Liggett high on their list of suspects, but when DC Lennox goes to his flat, Liggett has disappeared. One of Liggett's colleagues mentions him drinking with a copper named Jim, and Lennox confronts Carver and demands he admit his mistake to Meadows. Insp. Monroe makes Carver go on leave, but when Carver returns to the station he is so drunk he passes out in the yard. Sgt. Ackland and hide him in the FME's room and a van, but he ends up in the Elcott Arms where Lennox drags him out and forces him to confess. Tracing a call Liggett made from the pub to a hotel, Lennox poses as a taxi driver to drive their suspect to a nightclub where he and his associates are arrested in an SO19 raid.

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