Prince Harry's ghostwriter has hinted that TK Maxx links with Charles may have led to an attempt to discredit the Duke's memoir.
J. R. Moehringer, who had been working with Harry to help write his memoir "Spare", says that he had rigorously fact-checked every anecdote before his book was published in January this year.
He claimed he was confident the book did not contain any errors - especially as he feared a "smear" campaign from certain sections of the media.
However, when one chapter of his book came up for discussion the ghostwriter said he was perplexed.
In the book, Harry revealed he used to look forward to the yearly sales at TK Maxx, the discount clothing chain.
The author believed this to be a perfectly accurate anecdote until the store hit back at the claims, and said it "never has sales, just great savings all the time!"
He wrote in the New Yorker: "The monarchists at TK Maxx corporate, who rushed out a statement declaring that TK Maxx never has sales, just great savings all the time! Oh, snap! Gotcha, Prince George Santos!
"Except that people around the world immediately posted screenshots of TK Maxx touting sales on its official Twitter account."
The author hinted the book was trying to be discredited by the clothing chain - due to it's long standing links with King Charles and The Prince's Trust.
"Surely TK Maxx’s effort to discredit Harry’s memoir was unrelated to the company’s long-standing partnership with Prince Charles and his charitable trust," he said.
Despite some criticism towards the book after the royal revelations, he was unsure what mood the Prince would be in, especially after the global attention.
But, according to the author, he appeared in good spirits and was relieved the book was finally out as people could finally read his side of the story.
Mr Moehringer added: "Too late. The book was out, the party in full swing. As we walked into the house, I looked around, nervous, unsure of what state we’d find the author in.
"Was he, too, feeling fragile? Was he as keen as I was to organize a global boycott of TK Maxx?"
Mirror Online has approached TK Maxx for comment.
