Prince Harry's memoir will be "juicy" and should make the Royal Family "nervous", insiders have claimed.
Almost a year ago, Harry unleashed a "tsunami of fear" in royal circles by revealing he was to release a tell-all book.
Harry has been working on the “intimate and heartfelt memoir" with the help of ghostwriter JR Moehringer – a Pulitzer Prize-winning author - and he promises it will be "accurate and wholly truthful".
And according to insiders, Harry is set to drop more "explosive truth bombs" in the book - although a release date for the memoir has not yet been revealed.
One insider that works in publishing told Page Six : "It’s juicy, that’s for sure.”
While another publishing insider also told them: “There’s a lot of new stories in there about the past that Harry has not spoken about before, about his childhood … there is some content in there that should make his family nervous.”
However, the publication adds that one royal who won't be in for any criticism in the book is Harry's grandmother the Queen.
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Announcing the book last July, 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."
But 12 months on since the initial announcement, there has been no update on a release date, leading one insider to claim it has been delayed.
A royal insider said in The Sun: “If this book’s coming out this year as originally planned it should be in the publisher’s marketing and promotional list — unless they’re planning a surprise or there’s been a delay."
A spokeswoman for Transworld, part of Penguin Random House, said: “We don’t put every book on the list so there is nothing to be extrapolated from that.”
News of the book comes as Harry and wife Meghan Markle plan to travel to New York City next week for a special event in what will be their first public outing since the Queen's Platinum Jubilee celebrations.
The pair are set to attend the UN, where Harry will deliver a speech to mark Nelson Mandela Day, which is taking place on Monday (July 18).
The couple last appeared at the UN General Assembly in September 2021 but did not take part in the speeches in the assembly hall on that occasion.
The late Diana, Princess of Wales, memorably met Mandela in South Africa in March 1997, just five months before she died in a car crash in Paris.
During his 2015 tour of South Africa, Harry visited the cell on Robben Island where Mandela was imprisoned for the first 18 of his 27 years in jail before the fall of apartheid.
And when he returned to the country with Meghan in 2019, the couple met Mandela's granddaughter Zamaswazi Dlamini-Mandela and his former cellmate Andrew Mlangeni.
They also met with the former South African president's widow Graça Machel who told them: "It's wonderful meeting you. I'm sure we're going to be working together in the future. I can feel the vibe."
The UN has marked Nelson Mandela Day since 2009. According to its website, people are encouraged to celebrate the occasion by making a difference in their community.