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Having sacrificed his career in the Met, Clark ponders what to do next, until Deakin pays him a visit - and asks him to travel to Tunisia to help a tabloid newspaper substantiate a story about an MP's private life.

Naylor struggles to regain his composure following the death of his wife. Meanwhile, Connell's career in the Met hangs in the balance, and Clark accepts his first investigation after delving into the world of espionage.

Deakin asks Naylor and Clark to track down a missing person.

Connell calls upon Clark and Naylor for help after falling into difficulty with a client.

Clark takes on the task of providing protection for a Chilean general, who has been receiving death threats.

Connell goes undercover to find out who is setting fire to a chain of fur shops, while Clark fears for Naylor's safety after he accepts a job working for a dodgy pharmaceutical company.

Clark investigates when a computer engineer from the defence industry is found dead in his garage, and ignores Deakin's warning to steer clear of the investigation.

Clark and Naylor set up a profitable arms job, but Connell wants in on the action - but the pair are convinced that it's too dangerous.

Clark is asked by Deakin to go undercover as a gun runner for a major neo-fascist rally in Belgium, posing as a right-wing arms dealer.

Clark and Naylor are blamed for failing to stop an arms shipment heading for Northern Ireland, but realise that they have been double crossed when Connell reveals she is still working for the police - and has offered up her two former colleagues for a promotion. Trapped on a boat that is about to implode, will Clark and Naylor make it out alive?