The team reinvestigate the disappearance of two young political activists.

Brian Lane enters rehab to treat his alcoholism, but the rest of the team soon join him.

As the series comes to an end, the desiccated, neatly carved-up body of a butcher who disappeared more than 30 years ago is discovered, leading Sandra Pullman and her boys to pay a visit to Smithfield meat market in London, the original murder scene. It's a pity the butcher is dead, because he has a few questions to answer about why the body of a doctor was found hanging from a meat hook all those years ago at the back of his market stall. It's an episode peppered with revelations. We discover Gerry Standing's very interesting family history - he's descended from French Huguenots and is thus tormented by his colleagues for being a fake cockney, much to his annoyance: "Je suis ang-bleedingglais!" he protests. But it's Sandra who has to face up to a startling personal disclosure that has a direct bearing on the case and also throws a whole new light on her father. For once Gerry, Brian and Jack are left completely speechless.

The UCOS team find themselves reinvestigating the death of a well-known timeshare magnate.

The team exhumes the body of a car crash victim after claims she has been seen alive.

UCOS reinvestigate a high-profile riverboat disaster on the Thames after a new witness comes forward claiming the collision was the result of sabotage, rather than an accident. But the case means putting DAC Strickland's wealthy sailing chums under the investigation spotlight; what better motivation could the team have?

The team find themselves at the centre of a shocking cover-up.

UCOS are forced to re-open the investigation into producer Max Stone's death.