Anton Valensi

DCI John Luther returns to work after a spell of leave following the traumatic arrest of the serial killer Henry Madsen. Luther's first case is investigating the murder of the parents of child genius, Alice Morgan. He quickly deduces that Alice is responsible for the deaths, but the seemingly perfect crime leaves no evidence with which to convict her.

Luther must out manoeuvre a trained sniper on a mission to kill police officers. But as the body count rises, he has to uncover the killer's true motives. Meanwhile, Alice has been investigating Luther and to his horror, seems to know what happened to Madsen during his arrest. She baits him further by asking what Zoe would think if she knew the truth.

When a serial killer goes on the rampage, Luther must put his personal life aside and delve inside the murderer's mind to discover what is driving him to kill so many girls, and why. Meanwhile, serial killer Henry Madsen, the man responsible for Luther's extended leave, has woken up from his coma. Because of Madsen, it's too dangerous for Luther to see Alice any more, but can she ever accept this?