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

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

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

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

The team reinvestigate the disappearance of two young political activists.

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?

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.