Prince Harry could release another book that might include details of the Queen's death, according to a royal expert.

Royal biographer and commentator Robert Hardman weighed in on Prince Harry's relationship with King Charles while speaking at the Hay Festival. He claimed that the royal family was still hurting from his first book "Spare," but he might still release another. Per the "Charles III: New King, New Court, The Inside Story" author, the Duke of Sussex was taking notes when his grandmother passed away.

"It's not what Harry said, it's the fact that he said it, and he gave away so many secrets. And he was, effectively, at the time of the Queen's death, you know, he was taking notes," he said, per the Independent.

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Queen Elizabeth II and Prince Philip, Duke of Edinburgh visit the Brandenburg Gate on the final day of a four day state visit to Germany on June 26, 2015 in Berlin, Germany. Carsten Koall/Getty Images

Hardman added that considering the content of the first book, it's likely that Meghan Markle's husband would release a second part.

"If you do read that book, and as I said, it's amazing, but if you get to the bit about his wedding to Meghan, it boils down really to about four or five pages. Now, as an author, that says to me one thing and one thing only: part two might be on its way," he continued.

As for Prince Harry's relationship with his father, after the latter refused to see him when he visited England last month, Hardman said that the British monarch found the row "unsettling" and was "unhappy" about it.

Prince Harry previously hinted that there was enough content for a second book. Just days after "Spare" was released, the Duke of Sussex had an interview with The Telegraph's Bryony Gordon, saying he removed "concerned interactions" between him and his father, King Charles, and big brother, Prince William.

Prince Harry
Prince Harry, Duke of Sussex arrives for the Coronation of King Charles III and Queen Camilla at Westminster Abbey on May 6, 2023 in London, England. Andy Stenning - WPA Pool/Getty Images

"The first draft was different. It was 800 pages, and now it's down to 400 pages. It could have been two books, put it that way. And the hard bit was taking things out," Prince Harry said.

"There are some things that have happened, especially between me and my brother, and to some extent between me and my father, that I just don't want the world to know. Because I don't think they would ever forgive me."

The moment it was reported that Prince Harry could release another book, many believed the royal family would be concerned, considering what he had already shared in his first memoir. In "Spare," Prince Harry described a physical altercation between him and Prince William and called their dad "cold."

Prince William and King Charles
Prince Charles, Duke of Rothesay, Catherine, Countess of Strathearn and Prince William, Earl of Strathearn share a joke during a visit to Dumfries House on March 05, 2013 in Ayrshire, Scotland. Danny Lawson - WPA Pool/Getty Images

Buckingham Palace sources were convinced that Prince Harry might be forced to write another book for financial gain, The Telegraph reported.

It remains unclear if Prince Harry will release another book. However, many believe it will likely happen. Daily Mail columnist Maureen Callahan recently spoke about Prince William's rumored reaction to a possible second "Spare" publication.

"William is also said to be terrified of a 'Spare' two, another installment of a memoir filled with more grievances," Callahan told GB News.

Prince William and King Charles
Prince William, Prince of Wales, known as the Duke of Rothesay while in Scotland and King Charles III attend the National Service of Thanksgiving and Dedication for King Charles III and Queen Camilla, and the presentation of the Honours of Scotland, at St Giles' Cathedral on July 5, 2023 in Edinburgh, Scotland. Jane Barlow - Pool/Getty Images
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Prince Harry, Spare, Queen elizabeth