London Kills

DC Rob Brady and Trainee DC Billie Fitzgerald respond to a gruesome scene: a man found stabbed multiple times and left hanging from a tree. DS Vivienne Cole expects to lead the investigation but is shocked when DI David Bradford takes over, as he has been on leave since the disappearance of his wife.

A groom is killed at his bachelor party, and the man who reports the crime is the ex-husband of the bride. The detectives race to find the missing 18-year-old best man, who may have been the killer or another victim.

A man is found murdered on his houseboat, but the woman who alerted police has fled the scene. When Vivienne and Billie question the victim's widow, they discover he was having an affair with his best friend's wife.

Construction workers find the remains of a young man who appears to have died more than a year ago, but his sister claims he's been sending her postcards all the while.

When an eight-year-old boy finds his grandfather dead in a pub basement, he tells Rob that he was hit by a man with a baseball bat, but Vivienne doubts his story.

While the team looks into the murder of a Portuguese au pair who was recently fired from her job, Vivienne and Rob start investigating David on the sly.

After off-duty police officer Sgt. Ian Durrant finds a dead man at the wheel of his van, the detectives link the victim to a woman who was killed while in police custody. As DC Rob Brady was the one who discovered her dead, the case affects him deeply. When Trainee DC Billie Fitzgerald finds a connection to a murdered young cop, DI David Bradford suspects the killer could be a police officer.

When schoolboy Luis Moretti is found dead in a lake, the detectives learn of a potential connection to the recent suicide of a young girl. Meanwhile, DS Vivienne Cole tells David that she believes Detective Chief Superintendent Mulgrew was behind the threat to Rob's family, and she reveals her past relationship with the chief.

After a locksmith is murdered, Billie recognizes the victim and learns he was a witness to her father's death 10 years earlier. The investigation brings her face-to-face with her father's killer and forces her to wrestle with her personal and professional ethics. Vivienne pleads with her ex-husband to do the right thing, but he is afraid they're both in danger.

DC Rob Brady wakes up in his car with a witness lying dead next to him and is arrested on suspicion of murder; in his eagerness to clear Rob's name, DI David Bradford interferes with the investigation against DS Vivienne Cole's advice.

When Major Len Miller is found dead at the bottom of his stairs, a bloody fingerprint implicates his grandson; as David and Vivienne shed light on a dark secret from the major's past, they also must deal with the fallout from their indiscretion.

After young medical student Japesh Patel is stabbed to death, Billie wonders if it's connected to a similar, non-fatal attack on a gang member. Meanwhile, tensions between David and Vivienne reach a breaking point.