It's the 1920 gangster show that took the nation by storm - known for its dramatic storylines, fashionable wardrobe and the dreamy Cillian Murphy - it has gained a cult following since its debut series in 2013.
The BBC drama - which is also available on Netflix - wrapped up series 3 in true mobster style when Cillian's character Tommy Shelby had his entire family arrested.
And now the show's creator Steven Knight has revealed the scripts for series 4 are complete and it's going to be "the best yet".
Talking to BBC's Deadline he said: "I’m very, very excited because I’m just completing episode six of series four, which again I think is the best yet.
“And I’m loving it and it’s not like work, it’s not like a labour, I love doing it, and the boys are coming back and they’re loving the scripts.”
He also confirmed Tom Hardy's character Alfie Solomons - who made his debut in the second series in 2014 - will also be returning.
“Of course. We can’t do it without Alfie" he said.
Knight said filming for series four would begin in March which means earlier speculation of an autumn release date is unlikely.
Considering series three took four months to film and twelve weeks to edit fans might be forced to wait until spring 2018 to see the Shelbys back on TV.