Meghan Markle’s most personal secrets are reportedly on the verge of being exposed by none other than her half-brother, who is currently working on a revealing book centered on the Duchess of Sussex.

According to Radar Online, Thomas Markle Jr has set his sights on publishing a tell-all, and he’s already begun writing the manuscript while staying in the Philippines. Beyond the book, he’s also hoping it might pave the way for a related documentary or spin-off project.

Markle Jr has been outspoken in his support for their father, Thomas Markle, and says the book will shine a light on hidden truths about Meghan that, until now, have been kept behind closed doors.

“I’m working on it and it’s coming out! It’s going to be a good one, so watch out!” he declared when asked about the project.

He went on to express his hope that the book will lead into a film or docu-series once it’s released. “I am not a greedy person at all, and in this case it has nothing to do with money,” he added, though he acknowledged that earning something from the book wouldn’t be unwelcome. “It would be nice to have a little cushion from selling this book,” he admitted.