The film he is shooting now is the followup to the short-lived cult television series about a tenacious young private detective, played by Kristen Bell. The movie is due out in theaters in 2014.
The Hollywood Reporter said Vintage Books plans to publish the mystery books next spring.
"I started my career as a novelist. 'Veronica Mars' was first imagined as a novel. I'm thrilled that I'm going to get the opportunity to continue telling 'Veronica Mars' stories in a form I've loved and missed," Thomas said in a statement.
"Veronica Mars has always been a one-of-a-kind character, and, as a longtime fan of the series, I've always thought there is an immense amount of story left to be told," Vintage editor Andrea Robinson said. "Our goal for the book series is to appeal to fans of the show, but also to appeal to mystery readers and lovers of series featuring strong, intriguing female protagonists. Veronica Mars is a contemporary update to the tradition of noir crime fiction that was established by Vintage's Dashiell Hammett and Raymond Chandler, so it's exciting that we'll also publish her here."