It's a 410-page memoir, and interestingly everyone has wanted to read it since its release.

Gina Centrello, president and publisher of the Random House Group, said in the statement, "Vulnerable and heartfelt, brave and intimate, Spare is the story of someone we may have thought we already knew, but now we can truly come to understand Prince Harry through his own words."

It's the revelation in the book that has actually made it the best-selling non-fiction.

One of the main highlights is his relationship with Prince William and the conflict.

Another is his accusations about his father, King Charles and step Camilla.

Besides, it's an amalgamation of all an audience wanted or would have expected, a clear picture of his personal life, including his disclosures about drug use, grief and other experiences.

There hasn't been any report on the royal family's response to the book, as everyone has maintained silence.