He's one of the most popular fiction writers in the world, and New Hampshire native Dan Brown is at it again.Brown is wrapping up an international book tour for his latest novel, "Origin," a Robert Langdon thriller. The "Da Vinci Code" author recently described the latest thriller to a hometown crowd at the Music Hall in Portsmouth."The story begins with a brilliant futurist who has made a discovery that he believes will undermine the foundations of world religion," Brown said.His book tour includes documentary footage shot in Spain, the setting for the book, which weaves familiar themes of art, religion and science with artificial intelligence."The book is really about where we come from and where we're going, so it deals not only with evolution and creationism, but these ideas of what's next, what is in store for the human species," Brown said.Brown spent four years on "Origin," including a year and a half traveling and doing research. The rest was done at home in New Hampshire."The other two and a half years really was getting up every day, including Christmas morning at 4 a.m., and writing and really being committed to the process," he said.He said he takes a break every hour, something he used to keep track of with an hourglass."It's funny. At some point, I started ignoring the hourglass, so I got an application on my computer that will freeze my computer every hour for two minutes, and I'll make sure I go look out a window and go do some sit-ups or something," he said.Brown said little has changed since his success. He still spends his downtime locally with family and old friends."I'm just, I'm that guy who writes for a living," he said. "We still go out, and we talk about everything but publishing. It's great."Brown said his parents played a role in his paradoxical fascination with religion and science. The license plate his mother used when he was growing up was "KYRIE," the Latin translation of the Greek word for "lord." His father's license plate, in contrast, was "METRIC."For his next book, Brown says he has a significant change in mind."I think my next book will not be a Langdon book," he said. "I've got some other ideas. I'll come back to him, but I'm going to do something else for a while."