John Paxton is on the run, having been set up as a corrupt copper who has murdered his boss. Sean Kinney has gone into hiding following the collapse of his murder trial. Paxton hopes to find Kinney and make him reveal the identity of the corrupt officer who helped sabotage the murder trial, as this may lead Paxton to the person who set him up. Paxton turns to his wife, and tries to make her understand that he's an innocent man. He needs money, but a police officer arrives at his home, forcing Paxton to flee empty-handed.
Paxton breaks into the house of the murdered DCI Pete Chambers, and steals clothes, money and files on the Kinney case. He tracks down Kinney's house but when he gets there, he discovers that Kinney has been drowned in his bath, just as Paxton's colleagues had planned.
Without leads or money, Paxton approaches DC Liz Bird for help and together they try to track down the person who murdered Chambers and framed Paxton.