BBC bosses say filming will start early next year on the new series with further casting and details to be released closer to production.
Cross, says: “Now what? It’s a question Idris and I get asked a lot. What happened to John Luther after we last saw him striding unbowed through the streets of his city, his blood red London? It can’t be over, can it? There’s so much we don’t know. So much unfinished business.
“The thing is, we’ve been asking ourselves the same question. Because we love John and wonder what he’s up to. And as for me, I’m scared of the monsters.
“The face at the window. The hand under the bed. The shadow at the end of the street. Who’s going to stop them, if not John Luther?
“In the end, we picked up the phone to some old friends and asked if they’d like to find out what happens next. It turns out, they would. So that’s what we’re going to do. We’re going to find out what happens next.
“Now what? Luther’s coming back. That’s what.”
Star Elba added: “Neil, the BBC and I have been talking about a further season and I am thrilled that we have been able to bring it all together. I look forward to putting the coat back on.”
Piers Wenger, Controller of BBC Drama, said: “Luther is one of BBC One’s most iconic dramas and we’re thrilled that Idris Elba is reprising his role as John Luther.
“Neil Cross’ plans for his return promise some big surprises for what will be an utterly heart stopping and unmissable fifth series.”