Trial & Retribution - Season 10 (2007)

Roisin's interest in Stanford goes beyond the professional when she gets drunk and amorous and Walker has to warn her about her behaviour. He is also displeased when she expresses doubts as to the reliability of a former colleague who investigated the earlier murders. When a female officer is the victim of a vicious attack, Roisin has to face up to the truth. Is Max Stanford actually who he claims to be?

A blood-stained Milton Jones is found after his girl-friend is murdered. He claims that he was in amnesiac shock and cannot recall the murder, but only vaguely remembers that another man was in the victim's flat before her death. He is arrested but evidence seems to suggest his innocence. As he is black - and the dead girl was white - his family accuse Roisin of racist behaviour. Following two more slayings, it appears that a serial killer is targetting white women with black boyfriends.

Believing for the moment that Milton Jones is innocent Walker decides to use him as a helper in the enquiry. DNA and forensic evidence brings in a likely suspect but unfortunately Milton fails to identify him clearly in the police line-up. Roisin meanwhile discovers that the victims were linked by a night club though staff are hostile when she investigates it against Walker's better judgment. She is also having an affair with Neil Dench, a barrister in the case, and when it looks as if Milton is in the frame again, the relationship is seen as injurious to the trial's ...

Single mother Suzy McDonald walks into a nightmare when she returns home from work to find her baby daughter Poppy has been slain and her nanny,Leanne, has gone missing. The police eventually locate and arrest Leanne. They find out that her real name is Rachel Burns and that she has acted as a nanny for other families in the past, in each case using assumed names. Why, if she has nothing to hide?

The police discover that Rachel was once the nanny for a couple whose baby son,Joe, also died and Walker wants to exhume the child's body. Whilst the mother,Gina, is eventually cooperative, her husband Lee is dead against the idea and is actually defensive of Rachel, hardly surprising as he had had an affair with her. To complicate matters, Poppy's mother Suzy, is revealed to be in fragile mental health and could also be guilty of killing her child.

Metroploitan Police Commander Jack Daly and his wife Honor, a magistrate ,are murdered in their home and valuables are stolen in what initially seems to have been a burglary that went wrong. However there are several people who stand to benefit by the couple's death including her brother Paul, a man with gambling debts, Janet the house-keeper, also a beneficiary in their will, and most especially their twin sons Michael and Rory who will inherit a vast fortune. Given the high profiles of the victims Walker is under pressure from his superiors to get a quick result.

Despite an apparently water-tight alibi, there is something about the twins' behaviour that makes Walker uneasy, particularly as the dominant Michael seems to be controlling his asthmatic brother, and the boys are arrested and sent for trial. Family secrets start to be revealed when Michael claims a history of abuse from his father and it also comes out that Commander Daly was being unfaithful to his wife with Janet, the house-keeper, thus widening the net again.