It was the Netflix series that left horror fans delighted while others watched in sheer panic through their fingers.

And The Haunting Of Hill House's creator Mike Flanagan, 41, has teased the upcoming project further, claiming that the new anthology series will be 'a lot more frightening' than the original show.

Speaking of the iconic horror novel The Turn Of The Screw serving as inspiration behind The Haunting of Bly Manor, the acclaimed filmmaker also gleefully expressed that he was able to 'open up author Henry James' entire library of ghost stories' to serve the new series in the most terrifying way possible.

'A lot more frightening': The Haunting Of Hill House's creator Mike Flanagan, 41, has teased the upcoming follow-up, The Haunting of Bly Manor

Released last year, The Haunting Of Hill House, which became one of Netflix's breakout hits of the year, was a modern re-imagining of Shirley Jackson novel which goes by the same name.

The new series is based of James' 1898 book The Turn Of The Screw, which has been adapted many times for film and television, with a new movie version starring Finn Wolfhard.

Admitting that work on the new series was going great, Mike, who is married to Kate Siegel (Theo in the first series of The Haunting of Hill House) told Entertainment Weekly: 'It’s scarier. It’s a lot more frightening, just on a visceral level.'

'We were able to open up his entire library of ghost stories, stuff that’s never been adapted, and build the whole season out with the entirety of Henry James’ supernatural library. And that has been a real treat, because we really get to do things that I’ve never gotten to see before. It's really just our way in.'

'Scarier': The filmmaker also expressed that he was able to 'open up author Henry James' entire library of ghost stories' to serve the new series in the most terrifying way possible

Mike also explained that there was no direct link or continuation from the first series, but there were little 'Easter Eggs' along the way.

'There are definitely going to be things that will set off that little dopamine rush that those kind of connections create. But it’s not a direct connection from a story point of view,' he explained.

The new series follows the tale of a governess who goes to Bly Manor to care for two recently orphaned children, Miles and Flora.

Success: The Haunting Of Hill House, which became one of Netflix's breakout hits of the year, was a modern re-imagining of Shirley Jackson novel which goes by the same name

Popular: The new series is based of James' 1898 book The Turn Of The Screw, which has been adapted many times for film and television, with a new movie version

However, it quickly becomes clear that the grounds of the estate are — of course — haunted.

Original stars Henry Thomas, Victoria Pedretti, Catherine Parker, Oliver Jackson-Cohen and Kate Siegel have all signed up for The Haunting Of Bly Manor.

Newcomers to the Netflix horror series include Rahul Kohli, T’Nia Miller, Amelia Eve, Benjamin Ainsworth and Amelie Smith.

Fans have already been told that Victoria will play governess Dani who 'takes care of two very unusual children' played by Benjamin and Amelia.

'Scarier': Mike, who is married to Kate Siegel (Theo in the first series of The Haunting of Hill House) delightedly spoke of the new series (Pictured together in 2016)

Oliver has been cast as Peter, described as 'a charming fellow' who lives at Bly Manor and 'makes life very difficult for everyone there.'

Confirming Katie's involvement in the new series on Twitter this week, creator Mike Flanagan wrote: 'THE HAUNTING wouldn't be THE HAUNTING without fan favourite KATIE SIEGEL

'And I'm elated to confirm that she'll be joining us at BLY MANOR @K8siegel @haunting.'

The Haunting Of Bly Manor is due out next year but Netflix has yet to set an official release date.