Speaking about being given the opportunity to develop the famous character even further, James said, “The inside of Christian's head is a pretty daunting place to be.

“Writing Darker offered me new insights into his character and motivations, and I hope readers find those insights as compelling as I did.”

USA Today reports that Anne Messitte, publisher of Vintage/Anchor Books, has revealed that the new book will be “darker” and more “haunting” than ever.

“This new book is full of surprises,” Messitte says.

“Readers are going to see a darker and more haunted version of Christian’s character. Fans of the series will have much to discover and even more to discuss.”

There’s a new Fifty Shades book on the way – with a twist