King Charles Faces Alarming Warning as Charles Spencer Says He ‘Knows Lots of Things’ Left Out of Diana Book
King Charles has been confronted with another alarming development as Charles Spencer revealed he “knows lots of things” about the monarch that he deliberately left out of his Princess Diana memoir, while insisting his remarks should not be interpreted as a threat.
The comments come amid an increasingly public disagreement between Diana’s younger brother and his former brother-in-law, with Spencer revisiting sensitive events surrounding the late Princess after years of keeping many details private.
His book, Swan Song: Diana, My Sister, is scheduled for release on September 22, 2026, but excerpts and interviews surrounding the memoir have already generated significant attention.
Much of that interest has centred on Spencer’s disputed recollections involving the then-Prince Charles, some of which have prompted Buckingham Palace to take the unusual step of issuing a public response.
Spencer has now raised the possibility that considerably more information exists than what readers will find in the memoir during a 30-minute interview with the BBC’s Laura Kuenssberg.
“I know lots of things about the King which I chose not to include in the book because they were not relevant,” the Earl said while discussing his decision about what material belonged in Diana’s story.
The remark could easily attract attention given the existing disagreement between Spencer and the Palace, but the Earl pushed back against suggestions that he was issuing a warning to Charles.
Spencer insisted his comment was simply a statement of “reality” rather than a threat, explaining that he had deliberately excluded information that did not directly relate to the story he wanted to tell.
“If I were a salacious writer and wanted to write that sort of thing, I have plenty of other things I could have said,” Spencer added during the interview.
His clarification suggests he views the unpublished information as evidence of his restraint rather than material he is necessarily preparing to reveal in another attack on the King.
Nevertheless, the remarks arrive at a difficult moment for Charles, whose relationship with Spencer has come under renewed scrutiny as old disagreements involving Diana are discussed publicly once again.
The controversy also follows prolonged attention surrounding Andrew Mountbatten-Windsor and comes while Charles continues his cancer treatment alongside his responsibilities as monarch.
There is currently no indication that Spencer intends to publish the additional information he referenced, and his own comments explicitly reject the suggestion that he was threatening to do so.
Even so, his revelation that there are stories about Charles he consciously excluded ensures questions may continue beyond Swan Song. With the memoir already reopening painful chapters from Diana’s life, Spencer’s acknowledgment that he knows more leaves another sensitive issue hanging over the Palace.
