Quinnan finds the body of Dennis Quigley, a man who has died of a heart attack in his car. Whilst delivering the man's personal effects to his wife, Quinnan is mortified to find they include a gift to the man's mistress, a woman named Alice. Trying to do a good deed, Quinnan resolves to deliver the gift to its intended recipient, and manages to locate Alice and give her the gift. However, things become much more complicated when his wife Jenny discovers the gift and thinks he's having an affair, while CID discover that the dead man is wanted by Interpol for diamond smuggling. Suspecting the package that Quinnan handed over may well be a shipment of uncut diamonds smuggled in from Antwerp, Cullen is left dismayed after realising the evidence has been lost.

Sergeant Sheelagh Murphy is rushed to hospital with her baby's life hanging in the balance. With news of the baby's tragic death, Sheelagh struggles with the loss especially when her house is turned into a crime scene. Turning to PC Reg Hollis she voices her fears that Des Taviner may have been involved in the baby's death. Meanwhile PC Cameron Tait turns to drink in an effort to escape his feelings of guilt and responsibility. Having picked a fight in a pub, he turns to the bottle again and finds a sympathetic PC Kerry Young to help him home. Will Kerry fall for his drunken attentions? PC Tony Stamp and PC Honey Harman arrest an ex criminal, George Dooley, (Alan Ford, from Snatch and Lock Stock and Two Smoking Barrels) for assaulting his prospective son-in-law, Steve. George doesn't want Steve marrying his daughter because he seems to be embroiled in a replica gun racket. It's a scam Eva and Sam have been investigating but there's frustration ahead when DI Neil Manson hijacks the