New York Times Bestselling Author Mark Greaney joins us today to share more about his latest Gray Man novel 'Relentless.' Mark tells us that Spybrary listeners can read Relentless as the first foray into the Court Gentry series. Mark Greaney also shares more about the upcoming Gray Man movie, his writing process and his future writing plans. This interview is hosted by Spybrary listener and fan of the Gray Man series, Kashif Hussein.