'The Sinner' series 4 is here: Bill Pullman's detective drama so far

Netflix hit The Sinner is back for a fourth and final series of the bingeworthy psychological thriller starring Bill Pullman.

He's working on an all-new case, and this time it doesn't begin with a murder - although there's still plenty of creepy mystery for viewers to sink their teeth into.

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Find out what to expect from the new episodes, who's starring alongside Bill Pullman, and what the story is so far.

When can I watch The Sinner series four?

The latest and final series of the detective drama begins streaming today (Wednesday) on Netflix.

You can also catch up with series one to three which are all available on the streaming service.

What happens in series four of The Sinner?

Detective Harry Ambrose is finally attempting to retire from his incredibly stressful career catching murderers and is enjoying a relaxing trip to Maine with Sonya from series three.

But like any TV detective who dares to take a day off, it isn't a holiday for long as he witnesses Percy Muldoon, the daughter of a wealthy local family, walk off a cliff in an apparent suicide.

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The plot thickens when no body is found, though, and some other witnesses even claim to have seen Percy driving away from the scene.

Her mother, who appears to be hiding secrets, is completely convinced that Percy would not take her own life and Harry soon finds himself drawn back into the world of investigative policing as he looks at the creepy missing person case.

Who stars in The Sinner? Is Jessica Biel back?

Bill Pullman returns as tortured detective Harry Ambrose, the one constant thread through all the series of The Sinner so far.

Jessica Biel starred in the first series, but although her character Cora has not played a main role since, Biel stays on as executive producer.

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Returning from season three is Jessica Hecht, who plays Sonya Barzel and travels to Maine with Harry.

Percy Muldoon is played by Alice Kremelberg and the other Muldoons are played by Frances Fisher, Neal Huff and Michael Mosley.

What has happened in The Sinner so far?

Series one of The Sinner was possibly the creepiest so far, opening with a shocking scene as Biel's young mum character Cora was apparently triggered by a song playing at a sunny day out by the lake into the brutal murder of a man in front of scores of witnesses.

Harry developed a bond with the murderer and helped her to uncover a long-buried traumatic experience at a party which had gone on to affect her adult life.

By series two, Harry was investigating the unsettling case of a young boy who appeared to have murdered his parents in their motel room on a family holiday, but discovered a cult was behind the crimes, and the reason the boy was on the trip in the first place.

In series three, Harry was looking into a car crash that had one survivor, Jamie, who turned out to be responsible for his friend's death in the accident by delaying calling an ambulance.

Jamie was kicked out by his wife who had just given birth and went on a crime rampage, which included trying to kill artist Sonya who lived near the crash site, burying Harry alive, killing Harry's boss, kidnapping Harry's grandson, and eventually being killed himself by Harry.

The detective began dating Sonya in series three, who reappears with him in series four, and has had a troubled relationship with his adult daughter throughout each series - made no easier by the kidnap of his grandson.

The Sinner is streaming now on Netflix.

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