Watch the first trailer for Luther series 5, starring Idris Elba

BBC One's hit detective series Luther returns for a fifth series, as Idris Elba reprises his role as John Luther once more.

When the moonless shadows of London give birth to a new nightmare, DCI John Luther must once again confront the depths of human depravity.

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As a series of monstrous killings becomes ever more audacious, Luther and new recruit D.S. Catherine Halliday are confounded by a tangle of leads and misdirection that seems designed to protect an unspeakable horror.

But even as the case brings him closer than ever to the nature of true evil, a reluctant Luther must also face the ghosts of his own past. Striding back into the line of fire, he must choose who to protect… and who to sacrifice.

Whatever his next move, it will have devastating consequences for those around him - and will change John Luther forever.

Watch the first official trailer for the show, released by the BBC tonight.

Luther series 5 is coming soon to BBC One.