King Charles III may have another fast moving royal headache arriving at exactly the wrong time, because while the Palace is already dealing with the endless fallout surrounding Prince Harry and Meghan Markle, Sarah Ferguson is reportedly closing in on a potentially huge autobiography deal that could reopen some of the most uncomfortable chapters of royal history, including Andrew, Jeffrey Epstein, the emails, his arrest, and the years of scandal that followed.

According to the Mirror, Ferguson is reportedly close to securing a major deal, with a chapter-by-chapter synopsis already circulating and a bidding war said to be underway, meaning the question for Charles is no longer simply what Sarah might say, but how the King can prevent another royal book from becoming the next Spare and dominating the headlines for weeks.

And this time, Charles has something he did not have with Charles Spencer and Prince Harry: institutional and financial leverage.

The King cannot simply order Sarah Ferguson to remain silent, and trying to publicly fight a book before it is even released could make the whole thing far more valuable, but Charles does have the ability to control the royal privileges and financial arrangements surrounding the family, and the Andrew saga has already shown that he is willing to make dramatic changes when he believes the monarchy has to draw a line.

There is another particularly interesting financial lever.

The National Audit Office found that Charles pays the rent for Princess Beatrice and Princess Eugenie’s royal residences from his private income through the Privy Purse, despite both being non-working royals.

That does not mean Charles can simply threaten Sarah or legally punish her daughters for what she writes, but it does mean the King controls significant private financial support that could, in theory, become part of a much broader conversation about which royal privileges continue and which ones do not.

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And Andrew himself provides an even clearer example of the King’s authority: Charles initiated the process that removed his brother’s remaining royal style, titles and honours and required him to leave Royal Lodge for alternative private accommodation.

That is the real power Charles possesses. He does not need to fight Sarah Ferguson publicly, threaten her or turn the Palace into a courtroom. He can simply make clear that royal privileges come with boundaries, and that the monarchy will not automatically provide a safety net for every member of the family regardless of what happens.

The smartest move, however, may still be silence.

Harry’s memoir demonstrated how quickly a royal revelation can become an international story, particularly when the Palace responds to every allegation, because every denial creates another headline and every counterattack keeps the original controversy alive.

Charles therefore has several brutal cards on the table: financial boundaries, royal privileges, security arrangements. But perhaps most importantly. The King can refuse to make Sarah Ferguson’s book the center of the monarchy.

Sarah may be able to write the book. But Charles can decide how much of the royal machine follows her into it.

And that could be the difference between another royal publishing earthquake and another book that eventually becomes yesterday’s headline.