FILE - In this Feb. 6, 2015 file photo, author EL James attends a special fan screening of "Fifty Shades of Grey" in New York. James' latest book "Grey" shot to the top of Amazon's best-seller list ahead of its June 18 release on the promise it will flip the perspective of her hard-sex "Fifty Shades" story from innocent Anastasia Steele to kinky Christian Grey. (Photo by Charles Sykes/Invision/AP, File) Image Credit: Charles Sykes/Invision/AP

A copy of the upcoming Fifty Shades of Grey sequel has been stolen, just over a week before publication day, publisher Penguin Random House said Wednesday.

The publisher said Kent Police in southern England are investigating the theft of a finished copy of E L James’ new book, Grey. It said it could not comment further because a police investigation is under way.

Kent Police confirmed that “officers are making inquiries after receiving a report that a book had been stolen” on Monday.

The Fifty Shades trilogy has sold more than 125 million copies, and a movie released this year has grossed more than $500 million (Dh1.8 billion) worldwide.

The first three books followed the romance between young billionaire Christian Grey and college student Anastasia Steele.

Grey, the fourth in the series, tells the story from Christian’s point of view.

Penguin Random House said Grey would be published as planned on June 18, Christian Grey’s birthday.

Piracy can be a major headache for publishers of bestselling books. In 2005, thieves stole copies of the much-anticipated Harry Potter and the Half-Blood Prince from a warehouse north of London and tried to sell them to tabloid newspapers.