Trial & Retribution - Season 11

Rules of the Game (Part 1): When high-priced call girl Sofia Petrenko is found nude and strangled inside a trunk at London's Heathrow Airport, DCS Mike Walker ignores diplomatic warnings and arrests the trunk's owner, Ukrainian billionaire Vitali Malikov.

Rules of the Game (Part 2): DCI Roisin Connor doubts the Ukrainian's involvement in the crime, and steers the investigation in a new direction.

Kill the King (Part 1): Walker's friend Dr. Jonathan Carlisle, a famous pediatric surgeon, is killed.

Kill the King (Part 2): With no available suspects, the investigation delves more deeply into the victim's personal affairs.

Conviction (Part 1): Ex-con Terry Dyer maintains his innocence even upon release, but the angry father of his alleged victim seeks revenge and wounds him.

Conviction (Part 2): Dyer is implicated in another murder investigation by DS Satchell, muddying the waters of the reopened case against him.

The Box (Part 1): On leave in Glasgow, Walker is drawn into the search for an old friend's missing sister.

The Box (Part 2): The diary of one of the missing women indicates a new suspect in the case.

Tracks (Part 1): The discovery of 19-year-old Maria Cole's mud-covered corpse sends Walker and Connor searching for answers. Armed with sparse evidence, the detective duo clashes with a key murder suspect's father who will take any means, legal or not, to keep his son free.

Tracks (Part 2): It seems inevitable that Andy and Darren will be found guilty of murder, until all participants in the trial are profoundly affected by a single event. Walker must wade through the implications of the incident while also confronting a great struggle involving his own son.