BBC America announced earlier today that the fourth season of Luther will be coming to the channel on December 17th. All of the season, in fact:
— BBC America (@BBCAMERICA) November 5, 2015
The fourth season, consisting of three episodes, will see Luther on a leave of absence from the police force, but soon returns to London when he hears shocking news and a cannibalistic serial killer begins a murderous spree. Idris Elba returns to star. The season will also feature Darren Boyd, Rose Leslie, Dermot Crowley and Laura Haddock.