The book's title refers to the "spare" title he received as the brother of the heir to the British throne and the fact that he will likely never become king. Harry's brother, Prince William, is the eldest son of King Charles III and first in line to be king.
The synopsis reads: "It was one of the most searing images of the twentieth century: two young boys, two princes, walking behind their mother's coffin as the world watched in sorrow—and horror. As Diana, Princess of Wales, was laid to rest, billions wondered what the princes must be thinking and feeling—and how their lives would play out from that point on. For Harry, this is that story at last."
"With its raw, unflinching honesty, Spare is a landmark publication full of insight, revelation, self-examination, and hard-won wisdom about the eternal power of love over grief," the synopsis continued.
According to Insider, Prince Harry has pledged to donate the proceeds of the book to charity and has already donated $1.5 million to Sentebale, a charity that supports children and young people affected by HIV and AIDS.