Season 1 - Episode Guide

Ambitious Chief Inspector Tony Clark is head of CID at Mulberry Street police station and has applied for a transfer to the Flying Squad as a Superintendent. After a low-level drug dealer exposes corruption, Clark's office is "locked down" and he discovers that his transfer has been approved – but it's to the Complaints Investigation Bureau – which is not what he wanted.

Armed police have shot and killed an apparently armed youth, and Clark is running the investigation. The press make the most of the event to stir up unrest, the investigation is being hindered, and tensions rise, not least between Clark and his new boss, John Deakin.

A white WPC is alleging sexual assault by a black sergeant, however it appears that there is a hidden agenda. Meanwhile, Clark is in difficulty with his first disciplinary case as his main witness is missing.

The investigation into an assault of a prostitute by CID officers has reached a dead end, Clark's personal life is getting more complicated and pressure from Deakin is not helping. The assault case seems to be cracked from an unusual quarter, but with the only eyewitness dead, it seems there's only one way out.

Mike Carswell wins his appeal against conviction for murder but did corrupt officers conspire to convict him? Meanwhile, Mo is undercover investigating missing property and Dunning is looking to move upwards, out of the Met. A major witness in the Carswell investigation, however, turns out to be too close to Clark for comfort.

Clark and his team visit Liverpool to investigate an armed robbery conviction. A confession may have been beaten out of the robber, and a local reporter has an axe to grind.

Tensions rise on a picket line leaving Clark to discover who is responsible for serious injuries. Hard evidence is in short supply and old loyalties muddy the waters. Meanwhile, Clark's personal life is heading rapidly downhill.

A youth stabs Constable Norton to death and Clark's leave is cancelled to investigate an outstanding complaint against him. Was Norton the saint he is portrayed as or can Clark uncover a different picture?

Clark and his team investigate an officer who is caught apparently accepting a bribe but must discover whether he's been set up. Meanwhile, officers involved in the Carswell case, including Jenny Dean, are feeling under pressure. Clark has a suspect in the corruption case but politics intervene.

When Customs and Excise stage an observation on suspected drugs dealers on the Thames, one of their number, Fisher, goes missing. Huxtable asks Clark to investigate. Relations between all the different parties involved complicate the enquiry. Customs and Excise are convinced Thames Division is collaborating with the drugs squad to sabotage their operation.

Joey Pearce, a young man, is found hanging in his cell at St. Helen's nick. The arresting officer, DI Gordon, is called to help revive the boy, but he is dead. Clark is called out and starts investigating; one by one Clark interviews everyone in the custody suite. Pearce had been arrested with another man, Dilly, a known dealer, in possession of dealer quantities of crack.

Supt. Urquhart is arrested around the back of King's Cross Station with a prostitute in his car. Commander Huxtable is pleased; rumours about Urquhart's relationship with porn king Denis Ralston go back years. Urquhart's home is raided, and it is clear to Clark that he is running his life on more than a Super's salary.

Deputy Chief Constable Dunning has been suspended following allegations made by Billy Urquhart. At Jenny Dean's funeral Clark is rebuffed by her father. Deakin tells Huxtable that he has been sent home on leave pending the Dunning investigation and that he should take some time off himself.