Meghan Markle kept a diary of her time in the UK, after arriving as the actress girlfriend of a prince, and leaving as the Duchess of Sussex, according to reports.
According to a friend, the royal is said to have kept a journal of her time with Prince Harry.
Meghan shut down her personal blog, Tig, which gave fans a glimpse into her life personal life as she rose to fame in the hit TV show Suits, before she met Harry.
It is thought that hr first-person memoirs could be turned into a best-selling autobiography sure to rock Buckingham Palace.
Royal writer Andrew Morton, who has already penned Meghan: Hollywood Princess and wrote Diana: Her True Story in 1992, five years before her death, says he is intrigued by the possibility of a book in Meghan's own words.
He told the Daily Mail : "She is a good writer, with a nice turn of phrase. Remember she studied English in her first year at Northwestern College."
He adds that a first-person account would give Meghan "total control", something she and Harry have wanted more of as they seek a non-royal life in America.
According to the report friends close to Meghan have said she "desperately wants to shatter this image of being a demanding diva who was rude to royal staffers and others on her quest for fame and power"'.
The source added that Meghan said the book will help give her and Harry a clean slate.
"Meghan seems to think that readers will finally understand the monumental anguish and turmoil she had to endure with a stiff upper lip. Meghan said people need to see her vulnerable side, something the book does in great detail."
They added: "I think [Meghan] wants people to feel sorry for her, or at least have compassion for her and all she's been through, which has been anything but a fairy tale."
Meghan and Harry caused upset inside Buckingham Palace when the newly married couple decided to leave the Royal family, stepping down from their duties, and move with one-year-old son Archie to America.
The pair are currently living in a £15m luxury mansion in Los Angeles, California.
The couple's biography 'Finding Freedom' is due out in August and promises the truth behind a couple who are "not afraid to break tradition".
The Sussexes are understood to have co-operated with authors Omid Scobie and Carolyn Durand, with the book - which has been given the title Finding Freedom - set to "reveal unknown details".
According to the promotional blurb, it will also be "dispelling the many rumours and misconceptions that plague the couple" in Britain and North America.
"Finding Freedom is an honest, up-close, and disarming portrait of a confident, influential, and forward-thinking couple who are unafraid to break with tradition, determined to create a new path away from the spotlight, and dedicated to building a humanitarian legacy that will make a profound difference in the world," the description adds.
The book had the provisional title Thoroughly Modern Royals: The Real World of Meghan and Harry before being changed.
Several booksellers, including Barnes & Noble, Amazon and Bookshop, have started providing a pre-order option to their clients.
Mr Scobie is the royal editor-at-large for Harper's Bazaar, while Ms Durand is a royal contributor for ELLE.com and OprahMag.com, with their book said to have been written "with the participation of those closest to the couple".
Last month the Sussexes announced they were cutting all communications with four British tabloid newspapers, including the Daily Mirror, and will refuse to co-operate with them.
