Hollis and Hagen are laughed off by CID when they provide a tipoff on an upcoming armed robbery at a casino, provided by former getaway driver Jerry Mulligan, after he is arrested for stealing a milk float. However, it comes back to haunt them when a casino is robbed overnight, with Hollis wasting no time in mentioning CID's indiscretion to a furious Burnside. He tasks Lennox and McCann, on attachment to CID, with tracking Mulligan down. He provides info on another raid, so Burnside leads an undercover team there to catch the gang in the act, but Mulligan is attacked and the gang make a breakaway, leaving Burnside to pick up the pieces.

Yvonne has to deal with her niece when she is found unconscious having taken ecstasy pills left lying around her flat. Jim returns to work telling his colleagues that the trip has been delayed following an outbreak of legionnaires disease. Andrea tells Gabriel that it wasn't her who told MIT about Kerry's rape allegation but Smithy.

Sgt Mark Rollins surprises his boyfriend PC Lance Powell with a shock marriage proposal. PC Amber Johannsen kisses a barmaid at the Christmas do and PC Andrea Dunbar kisses Smithy, oblivious to the fact that DI Neil Manson has seen them. Shirley is found in a car crash and a stash of cocaine is found in the vehicle. She refuses to talk and PC Yvonne Hemmingway can't help but think the worst of her but after eventually hearing the whole story she realizes she may have judged Shirley too harshly.