"I mean, his whole life is an incredible story. So it's fascinating that he's actually willing to open up and tell it himself."

Barnes & Noble customer Caley Carlisle picked up a copy. "I think it's interesting because the royal family up to this point has been so private."

Director of Books at Barnes & Noble, Shannon Devito, predicts "Spare" will fly off the shelves.

"We're already expecting this to be one of our biggest books of 2023, hands down. And whether you love the House of Windsor, hate the House of Windsor, have an opinion one way or the other. The only way to really get there is to read this memoir and kind of form an opinion yourself."