The book is an unauthorised biography on the Duchess of Sussex written by journalist Tom Bower called Revenge: Meghan, Harry and the war between the Windsors.
It claims to be a "characteristically explosive and rigorously researched account of the rift between the Sussexes and the rest of the Royal family, touching on every aspect of scandal and suspicion".
Bower's book is very different to Finding Freedom, the biography that was written by Meghan and Prince Harry's friends Omid Scobie and Carolyn Durand.
At one point in the book, Bower writes that the Queen was relieved when she found out Meghan wouldn't be able to attend Philip's funeral last year.
The Duchess was seven months pregnant and claimed doctor's orders prevented her from attending with Harry.
"In Windsor Castle the Queen was preparing to face the public on one of the saddest days of her life," Bower wrote.
"To comply with COVID restrictions she would grieve alone inside the chapel. 'Thank goodness Meghan is not coming,' the monarch said in a clear voice to her trusted aides."
The author added, "Harry's presence remained a problem."
The royal family didn't know at the time that the Duke of Sussex had recorded an interview about mental health with Apple TV+, where he slammed his brother Prince William and his father Prince Charles.
The book reads, "Sitting alone and isolated, the 94-year-old monarch's grief was concealed behind a black mask. Everyone was moved by her dignity. William looked tense, Kate serene, Charles visibly anguished. Only Harry's expression defied accurate reporting.
"None knew that Harry, the once adored young prince, had betrayed his whole family."
During the Apple TV+ interview, Harry shared a story from Princess Diana's funeral, revealing his father's advice to his sons was to resign themselves to 'suffering'.
"My father used to say to me when I was younger, he used to say to both William and I, 'Well it was like that for me so it’s going to be like that for you,'" Harry said.
"That doesn’t make sense. Just because you suffered doesn’t mean that your kids have to suffer, in fact, quite the opposite - if you suffered, do everything you can to make sure that whatever negative experiences you had, that you can make it right for your kids."
He also added that the royal family met "every single ask, request, warning" for help with the harassment he and Meghan faced in the media with "silence or total neglect".
Never miss a thing. Sign up to Yahoo Lifestyle’s daily newsletter.
Or if you have a story idea, email us at email@example.com.