News of a murder interrupts Luther's date with Mary; Ripley must investigate the Jared Cass murder alone.

A vigilante killer is determined to punish past offenders; the campaign pushes Luther to his limits.

Luther must clear his name after being accused of crimes he didn't commit while working to stop the vigilante killer.

Luther takes a leave of absence from the police; when an old colleague brings him a shocking piece of news, he is drawn into investigating the crimes of a gruesome killer.

On the trail of a horrifying cannibalistic killer, Luther finds himself haunted by ghosts from his past.

A new spate of nightmarish murders brings DCI John Luther to once again face the depths of human depravity on the streets of London; as the body count rises, Luther attempts to catch a killer and save his own neck.

Luther must confront a demon from his past, as both the police and Cornelius converge on his home; with Halliday convinced that the body in the morgue isn't their killer, Luther attempts to put his own troubles aside and find the true murderer.

With his friend in peril and a young woman kidnapped by the relentless serial killer, Luther tries to protect the innocent while preventing Cornelius' violent revenge from consuming him.

Reeling from the death of his friend, Luther races to save the others from Cornelius' terrible retribution; with Luther's increasing absence from the case, Halliday heads the hunt for a killer on the loose.