The memoir's title is a nod to Harry's birth order as the younger brother of William, the heir to the throne. Harry is fifth in line to the throne, behind William and William's three children.

\"PHOTO:
Pool/Getty Images, FILE
PHOTO: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry leave after attending the Grenfell Tower National Memorial Service at St Paul's Cathedral on Dec. 14, 2017 in London.
>

Harry, who left his senior working royal role in 2020, said he believes sharing \"the truth\" is what it will take to help bring peace between him and his royal relatives, with whom he has faced tensions for the past several years.

\"Ultimately, what this all comes down to is, I don't think that we can ever have peace with my family unless the truth is out there,\" Harry said in the interview airing Monday.

Harry said previously that the memoir would be a \"firsthand account of my life that's accurate and wholly truthful.\"

The Duke of Sussex writes in his memoir about his life growing up in the royal family -- including the trauma of losing his mother and his time in the military -- as well as his decision to step down from his senior royal role, his healing journey and fatherhood.

\"PHOTO:
Random House
PHOTO: Cover of the book 'Spare' by Prince Harry.
>

\"He is not holding anything back.\"@michaelstrahan with a look at his interview with Prince Harry ahead of the release of his memoir \"Spare\" — which covers his relationship with Prince William, his time in the military and much more. Watch Monday on @GMA. https://t.co/me8QGyt663 pic.twitter.com/UkXqIO4faL

— Good Morning America (@GMA) January 5, 2023

The release of the highly-anticipated memoir comes just weeks after Harry and wife Meghan, the Duchess of Sussex's closely followed docuseries, which aired on Netflix and broke records as the platform's biggest documentary debut ever, according to the streaming service.

Watch Michael Strahan's interview with Prince Harry on Monday, Jan. 9, at 7 a.m. EST on \"Good Morning America\" and the special, \"Prince Harry: In His Own Words | Michael Strahan Reporting\" at 8:30 p.m. EST on ABC News Live.

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