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.

When the body of a woman turns up by the river, the detectives track a suspect through a dating site, only to find he may have shot himself. While Rob and Vivienne disagree about whether it was a murder-suicide, Billie worries about Amber, a witness in another case.

With Billie stabbed and her attacker on the loose, Vivienne blames herself for not recognizing that Billie was in danger. As the team scrambles to track down Amber, they discover that there's more to her than meets the eye.

Construction workers find the remains of a young man who appears to have been strangled to death more than a year ago, but when his sister is notified, she claims he's been sending her postcards all the while. The detectives suspect the involvement of the victim's housemates, who seem to be hiding something.

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. Later, Vivienne pressures Rob to report that he covered for David on the night of Sarah's disappearance.

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, but he remains a step ahead of them.

When a father and son are shot execution-style in broad daylight, the detectives immediately suspect a gangland hit and worry the violence could escalate. David sees an opportunity to finally apprehend crime kingpin Adrian Cook.

In exchange for turning a blind eye, Adrian gives Rob the name of someone who knows where Sarah is, but that person turns up dead. Now believing that Sarah may still be alive, David and his team race to her find her.

The detectives investigate a string of murders. Could the killer be a police officer? Meanwhile, Rob is forced to hand over vital evidence when his family is threatened.

As the detectives investigate who murdered a schoolboy, Vivienne is forced to reveal her intimate connection to a suspect.

As Billie comes face to face with the man who killed her father, Vivienne pleads with her ex-husband, a Detective Superintendent, to do the right thing.

The detectives lock horns with a widow who refuses to grieve. Is she a cold fish or a ruthless killer? Chief Super Mulgrew gives the detectives the slip, with fatal consequences.

David and Vivienne cross a huge line, both professionally and personally.

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

A delivery driver is killed, and a trace of his movements places him at a pub that his wife frequents; she has a motive, but she's an alcoholic and can't remember if she killed him or not; when David doesn't turn up for work, Vivienne confronts him.

A boxer confesses to killing her manager, but the detectives think she may be covering for her father; when a suspect accuses David of planting evidence, he's devastated to realize the team has doubts, and he makes a decision about his future.