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.
When American Ranger John Cutter fails to save a family being held hostage and loses his entire team in a confrontation with infamous Ukrainian arms dealer Igor Rodin, he is discharged from the army.