"He's a liar," Nichol Kessinger, 30, told The Denver Post ... and is the author of the No. 1 New York Times best-selling book, Not All Diamonds and Rosé: The Inside Story of the Real Housewives ...

Nichol Kessinger said in a conversation with investigators ... Kessinger’s internet searches also included queries about a book deal Frey obtained, along with Frey’s net worth, according ...