Prince Harry has written a book about his life, his mother's death, his relationship with newspapers, and being a royal. It is called "Spare". The word "spare" means something that is only there in case another thing is lost or broken. "Spare" points to the fact that Harry would become king only if his father and brother died. The 410-page memoir has been printed in 16 languages. It is the fastest selling non-fiction book ever written.

A member of Britain's Royal Family has never spoken so honestly before. Many stories in "Spare" are shocking. Harry writes about why he moved to the USA, how he fell out with his family, and why he stopped being a royal. He said UK newspapers have written many bad things about his wife Meghan. He said his brother Prince William attacked him. He also wrote about how many Taliban fighters he killed in Afghanistan.