When the moonless shadows of London give birth to a new nightmare, John Luther (Idris Elba) once again confronts the depths of human depravity. As a series of monstrous killings becomes more audacious, Luther and new recruit DS Catherine Halliday (Wunmi Mosaku) are confounded by a tangle of misdirection that seems to protect an unspeakable horror. But as the case brings him closer than ever to the nature of true evil, a reluctant Luther faces the...