Mary Trump is about to break her silence over the Trump family secrets after being reserved for two decades. President Donald Trump's niece is about to release her new book, Too Much and Never Enough: How My Family Created the World's Most Dangerous Man, which promises to reveal the deepest and darkest secrets of the Trumps.

Mary Trump has been mum about the issues of her uncle, Donald Trump, for two decades. She last talked about the family when she detailed the their legal battle over Fred Trump Sr.'s estate in 2000 with the New York Daily News.

Now, it looks like she is back with a vengeance. According to The Daily Beast, the upcoming cover contains a lot of "harrowing and salacious" details about the Trump family. She also detailed how she became the source of The New York Times' 2018 Pulitzer Prize-winning investigation about the former television personality's taxes.

At the time, it was her who gave the publication information about the senior Trump's tax returns. She also revealed other confidential financial documents of the Trump family, Celebrity Insider noted.

Mary Trump and her brother, Fred Trump III, used to fight with the rest of the family over the will of their grandfather. At the time, she claimed that Donald Trump and his other siblings, Robert, Maryanne, and Elizabeth, denied them to get their fair share of Fred Sr.'s estate.

The two siblings acknowledged that Fred Sr. left his fortune to his four living children. However, the wife and kids of the late Fred Trump Jr., Mary and Fred III's father, did not get their equal share.

In the now-controversial book, its publisher, Simon & Schuster, revealed that it would explain how Donald Trump became the man who now "threatens the world's health, economic, security and social fabric," The Guardian reported. Mary Trump would unleash the traumas, "destructive relationships," and the combination of "neglect and abuse" that happened in what she called the "one of the world's most powerful and dysfunctional families."

Now, there were reports that Donald Trump wanted to stop the book's publication, just like what he aimed to do with John Bolton's tell-all. News about Mary Trump's book emerged on Sunday, June 14. After that, other information about it appeared on Amazon.

In the book's description, it noted that Donald Trump's only niece, a trained clinical psychologist, would "shine a bright light" on the Trump family's so-called dark history. It would reveal an "authoritative portrait" of Donald Trump and the alleged toxic family that made him.