4. Pride

Ronnie and Joe are on the hunt for the killer of a seemingly innocent family man when the investigation leads them to Ronnie's old boss, ex-DI Natalie Chandler. The former detective inspector's father is a man in his 70s called Eddie Stewart and he is the prime suspect. Ronnie has a tough time telling Natalie that her father stands accused of murder. No one can understand why Eddie would commit such a crime, least of all his own daughter. Jake and Kate try to be sympathetic, but explain that there is nothing they can do unless Eddie agrees to cooperate – a man has died and someone has to take responsibility.

Natalie persuades Ronnie that he must go above and beyond the call of duty to try to find the real killer – a move that gets him into trouble with an increasingly frustrated Wes. Just how far is Ronnie prepared to go to help his old friend? Guest starring Roy Hudd, Harriet Walter, Martin Jarvis and Geoffrey McGivern.