One of the people leaking information on Donald Trump may have been a family member. The daughter of Donald Trump’s late brother is preparing to publish a book that The Daily Beast says will detail “harrowing and salacious” stories about the president.

Mary Trump, 55, the daughter of Fred Trump Jr. and eldest grandchild of Fred Trump Sr., is scheduled to release Too Much And Never Enough on Aug. 11, just weeks before the Republican National Convention.

One of the most explosive revelations Mary will detail in the book, according to people familiar with the matter, is how she played a critical role helping The New York Times print startling revelations about Trump’s taxes, including how he was involved in “fraudulent” tax schemes and had received more than $400 million in today’s dollars from his father’s real estate empire.

The Daily Beast says Trump’s niece will reveal that she supplied the New York Times with “Fred Trump Sr.’s tax returns and other highly confidential family financial documentation.”

The Times refused to comment on the report and there is no comment from the White House yet either. Simon & Schuster is also keeping details of the books under wraps.

This is the second book involving the Trump family that we have learned about in the last week. The Art of Her Deal: The Untold Story of Melania Trump will be released tomorrow.