Of course, Bill Pullman will be returning to his role as Detective Harry Ambrose. Alongside him, however, we've got a new face.
Matt Bomer, of Will & Grace and Doom Patrol fame, will star alongside Pullman in a new recurring role as a character called Jamie.
Jamie is a resident of Dorchester and is about to become a father, he eventually will be forced to turn to Detective Ambrose for help after an accident. Or so we're told, anyway.
Matt Bomer. Credit: PA
Bomer tweeted out his pleasure at joining the show's cast a few days ago. He said: "Words can't really explain the excitement I feel getting to be a part of a show that I'm such a fan of, not to mention working with this incredible cast. Also: it's really nice to be coming home to @USA_Network - can't wait!"
Sounds like he's up for the job, at least. Good stuff.
So, what can we expect to see in season three then? Well, luckily for us, USA Network - the network that makes the show, although it is shown on Netflix in the UK - have a handy synopsis on their website to give us a flavour.
The Sinner. Credit: USA Network
It tells us: "The Sinner's third instalment follows Detective Harry Ambrose (Pullman) as he begins a routine investigation of a tragic car accident on the outskirts of Dorchester, in upstate New York.
"Ambrose uncovers a hidden crime that pulls him into the most dangerous and disturbing case of his career."
Sounds cool. Can't wait.
On top of that, they have also confirmed that Derek Simonds will return as the showrunner for the latest season. Jessica Biel - who was nominated for an Emmy, a Golden Globe, and Critic's Choice Award for her part in season one - will be an executive producer, alongside Michelle Purple.
Bill Pullman. Credit: PA
At least two of the episodes will be directed by Adam Bernstein, who is best known for directing episodes of Breaking Bad, and Fargo. He should fit in just fine on The Sinner with that kind of experience.
When it debuted in the USA, The Sinner was the best new series on cable television for the whole of 2017. Alongside numerous award nominations, including those for Jessica Biel's performance, it was also certified fresh on Rotten Tomatoes.
That's a pretty good recommendation, if ever there was one.
In the UK, you can currently watch series one and two on Netflix.
Featured Image Credit: USA Network