When Idris Elba returns to Luther for a fifth season he will be joined by Wunmi Mosaku.

The actress is most well-known to American audiences for her work in Fantastic Beasts and Where to Find Them and Black Mirror. She won a BAFTA for the BBC mini-series Damilola, Our Loved Boy.

Mosaku will play John’s new colleague Detective Sgt. Catherine Halliday.

The coat is back: @idriselba shoots series five #Luther @BBCOne, with new cast member @wunmo playing D.S. Catherine Halliday – https://t.co/IR0hlJQQ9J pic.twitter.com/T1LyV1bVTm

— BBC Press Office (@bbcpress) January 11, 2018

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 change John Luther forever.

There is no word yet on a premiere date, but Luther is currently filming in London.

Source: Variety