Meghan Markle’s sister is “piggybacking” on the duchess’s high court privacy case to market a biography which will be “vitriolic” about the royal, experts tell Newsweek.

Samantha Markle’s memoir, The Diary Of Princess Pushy’s Sister Part 1, is due to be released on Sunday, January 17, two days before a crunch court hearing.

Meghan is suing U.K. tabloid the Mail on Sunday for publishing a letter she sent to her and Samantha’s father Thomas Markle Sr.

She hopes to be handed victory without the need for a trial after a two day hearing, which a recent High Court judgement said is due start on January 19.

However, she now stands to go into the real life court room drama amid a new raft of stories about her relationship with Markle Sr. due to the book.

Meghan Markle Commonwealth Day Service 2020
Meghan Markle attends the Commonwealth Day Service 2020 at Westminster Abbey on March 9, 2020 in London, England. Her half sister Samantha Markle is planning to release a memoir, the Diary of Princess Pushy’s Sister Part 1.
Max Mumby/Getty

Royal biographer Ingrid Seward, author of Prince Philip Revealed, told Newsweek: “Books don’t usually pop out without quite a lot of planning. They don’t just suddenly say we’re going to publish it tomorrow.

“They would have known that Meghan was having this court case for at least a year because we’ve known for at least a year. I’m sure going to the High Court, whether you’re there in person or not, will be very destabilizing anyway.

“I’m sure the whole thing will be very tense. Even though she’s 6,000 miles away. The book would be just another vast unpleasantness. I should think it will be pretty vitriolic, but of course it will have been run by a lawyer, and you know how litigious Meghan is, so I should think it will be quite sanitized.”

Seward said Buckingham Palace will not comment on the biography in order to avoid bringing extra attention to it.

The book is not currently on Amazon but is for sale in paperback at $17.99 through Barnes & Noble, which lists Barnes & Noble Press as the publisher. Online, Barnes & Noble Press offers self publishing services.

Samantha Markle first announced she was planning a memoir of that name in 2017 when she said there would be parts Meghan “won’t like” in an interview with the Daily Star.