And based on the Duke and wife Meghan Markle’s explosive interview with Oprah Winfrey, it’s easy to understand why those behind the scenes at the Palace may be nervous.
In fact, the source claimed there is a “tsunami of fear” within royal circles about what Harry will say in the tell-all book, which the publisher promises will be “intimate and heartfelt”.
Meanwhile Prince Charles was reportedly surprised by the news, and insiders say Harry “scrambled” to tell his family about his new project just “moments” before the announcement was made.
The book won’t hit the shelves until next year, but we’ve had a look at everything we know about his memoir so far.
“Tsunami of fear” in royal circles
Unsurprisingly, news that Harry is going to share even more details about royal life hasn’t gone down well behind palace walls.
A source told the Mirror the thought of the book has sparked a “tsunami of fear” in royal circles.
They said: “Ever since leaving royal life, Harry and Meghan have made claim after claim of how they allege they have been treated.
“They say that it is their truth but there is only ever one truth.
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“Since their interview with Oprah Winfrey tensions have been running very high as much of what they said has since been proven to be unreliable at best.
“There is a now tsunami of fear among the royals over what Harry will write.
“Many hope he may correct a few things but do not hold much hope.”
Harry ‘scrambled’ to tell royals – and what they’ve said
Much like their initial decision to quit royal life, it seems Harry gave his family very little warning about his plans.
A source told The Sun: “Harry scrambled to contact his family only when he knew the story was coming out – just moments before it became public.”
It is unclear whether the Queen was told in advance.
None of the royal family have spoken about the book and Clarence House did not want to comment.
Palace aides did want to answer questions as Prince Charles and Duchess of Cornwall attended a reception at the Duchy of Cornwall Nursery, in Lostwithiel.
One said: “We are more likely to answer questions next year when this memoir is due to be published.”
Another when told the news last night said “oh gosh”.
How much will Harry earn?
Although it has not been confirmed how much the Duke is getting for the book deal, it has been reported he could have netted an advance worth £14.5 million.
The Sun cites royal expert Robert Jobson as saying that Harry has received a multi-million pound advance for the title.
However, it has been announced all proceeds from the book will be donated to charity.
The prince works closely with a number of important causes and organisations but they haven’t shared details of which one he’ll chose to benefit from the book sales.
Release date and publisher
Harry’s book is being published by US publisher Penguin Random House, which has bought the literary rights to the memoir.
There is no definite release date but it is scheduled to be available in late 2022.
The transcript for Harry’s book was due to be handed in next month, however Harry pushed this back after Lili’s birth and due to other commitments. The deadline has now been pushed back to October.
The book is being ghost-written by Pulitzer winner J.R. Moehringer, who has previously written memoirs for tennis legend Andre Agassi and Nike co-founder Phil Knight.
The 56-year-old has also written his own autobiography called “The Tender Bar” which is being made into a movie by George Clooney.
What it will include
According to Prince Harry, his book will be a first-hand account of his life that’s “accurate and wholly truthful”.
And it’s promised that it will share his “adventures, losses, and life lessons”.
However, it is unclear exactly what will be included in the book – although it may well shed new light on why he and Meghan quit the Firm to move to the US.
And with several unanswered questions about Harry and Meghan, could these be addressed in the book?
For example, will he go into more detail about one of the most shocking lines from his bombshell tell-all interview with Oprah Winfrey in March that he had “conversations” within the royal household about how dark his son Archie’s skin might have been before he was born?
Neither he nor Meghan have revealed who these conversations had been with.
He may also lift the lid on what happened at the so-called Sandringham summit, where Harry, the Queen, Prince Charles and Prince William discussed his future role after it was announced they were stepping back as senior royals in 2020.
Given his ongoing rift with Prince William, will Harry address what caused the feud and if it’s still bubbling?
Meanwhile, royal fans will be also keen to see if Harry addresses the situation surrounding the naming of his new daughter Lilibet and the incident in the run-up to his wedding, where it is claimed the Duchess of Cambridge and Meghan were left in tears.
What Harry has said about it
Announcing the new book, both Harry and the publisher issued a statement sharing their excitement about the launch.
Harry said: “I’m writing this not as the prince I was born but as the man, I have become.
“I’ve worn many hats over the years, both literally and figuratively, and my hope is that in telling my story – the highs and lows, the mistakes, the lessons learned – I can help show that no matter where we come from, we have more in common than we think.
“I’m deeply grateful for the opportunity to share what I’ve learned over the course of my life so far and excited for people to read a firsthand account of my life that’s accurate and wholly truthful.”
The blurb from publisher Penguin Random House read: “In an intimate and heartfelt memoir from one of the most fascinating and influential global figures of our time, Prince Harry will share, for the very first time, the definitive account of the experiences, adventures, losses, and life lessons that have helped shape him.
“Covering his lifetime in the public eye from childhood to the present day, including his dedication to service, the military duty that twice took him to the frontlines of Afghanistan, and the joy he has found in being a husband and father, Prince Harry will offer an honest and captivating personal portrait, on that shows readers that behind everything they think they know lies an inspiring, courageous and uplifting human story.’”