Prince Harry's memoir, Spare, will be released on January 10.

Ahead of the book's release, the Duke of Sussex will also give two new bombshell interviews filled with even more facts.

But while royals such as Prince Charles and Prince William may fear what Harry might say about them, one royal biographer does not believe the memoir will do lasting damage.

"Harry's book will cause concern and make headlines around the world, but it will not destroy the royal institution," Andrew Morton said (via OK!)

"And if the institution is so weak that it cannot withstand a junior ghostwriter's book, then keeping it It's not worth it."

"I mean, frankly, a book written by (the monarch's) future queen, Princess Diana, or a book written by the future King Charles, is much more relevant and much more important."

Morton added, "The royal family is preparing for two things. With the coronation approaching, one gets the sense that palace officials are bracing themselves for King Charles, lest people be reminded of his emotional hinterland."

Morton also noted that, "The royal family has been preparing for the coronation of King Charles for some time now, and the royal family has been preparing for the coronation of King Charles.

"And they are concerned that Harry's memoirs will also affect people's perception of King Charles."

While the content of the spare is not yet known, royal commentators and insiders suggest that it will mainly focus on Harry and William's rivalry and jabs at Princess Kate, but will ~spare~ the King from excessive criticism.