BAFTA winner Wunmi Mosaku has joined Season 5 of Luther.

The upcoming season of the award-winning British crime drama has commenced filming.

Mosaku will portray a new recruit, D.S. Catherine Halliday.

The season’s description: As a series of monstrous killings becomes ever more audacious, Luther and new recruit 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.

“It’s fantastic to have Idris Elba and the team back filming in London and we are thrilled that the exceptional Wunmi Mosaku will be returning to BBC One to join this already stellar cast. Neil Cross’ scripts for this fifth series of Luther are explosive and fans won’t be disappointed,” said Piers Wenger, Controller of BBC Drama.

“There aren’t many shows where the first day of filming feels like an event but Luther is certainly one of them. Thrilled to be in production with a new series of the show that has set the bar in terms of British television crime drama,” said Hilary Salmon, Executive Producer for BBC Studios.

Mosaku, who just starred in the ITV series Fearless and Netflix’s End of the F***ing World, won a BAFTA for her role in Damilola, Our Loved Boy.