Sienna Guillory to play Luther’s girlfriend.

Sienna Guillory (Resident Evil, Inkheart, Love Actually, Eragon) has joined the cast of ‘Luther’ series 3 as Luther’s new love interest, Mary.

Starring Idris Elba, the series is created and written by Neil Cross, and is a co-production between the BBC and BBC America and began filming this week on four 60-minute episodes to air on BBC One.

Luther is back under intense pressure, with two conflicting crimes to investigate and a ruthless ex-copper determined to bring him down.

Luther’s life is his job; that is, until love crosses his path and offers him a chance of happiness. Guillory plays Mary, who works in a vintage clothes shop. She meets Luther in a chance encounter.

Guillory says: “You realise why Luther is so good when you read Neil Cross’s scripts, and then you meet Idris and understand what ‘untamed’ means. There is no other set I’d rather be on, and I love the disastrous fun of being Mary Day, the right girl in the wrong place.”

Idris Elba, playing Luther, adds: “I want to thank the fans for waiting so patiently for the new season. We’re thrilled to deliver it to you. Here comes John!”

Warren Brown (Good Cop) returns as DS Justin ‘Ripley’, Nikki Amuka-Bird as DS Erin Gray, Dermot Crowley as DSU Martin Schenk and Michael Smiley as Benny Deadhead. Further guest stars include Lucian Msamati (Game of Thrones) and Ned Dennehy (Parade’s End, Tyrannosaur).

The BBC Executive producer is Phillippa Giles and the producer is Claire Bennett.

The third series of ‘Luther’ will air on BBC One next year.