A gruesome serial killer is terrorizing London while brilliant but disgraced detective John Luther sits behind bars. Haunted by his failure to capture the cyber psychopath who now taunts him, Luther decides to break out of prison to finish the job by any means necessary.

Two ambitious detectives stakeout a potential drug deal.

Oliver is a writer whose personal life was marked by a sinister childhood encounter: his sexual awakening at the hands of a dead girl. When Oliver's path crosses Laura's, an enigmatic girl seeking refuge as she tries to recover her memories, destroyed in an apparent suicide attempt, dark secrets threaten to destroy them both.