Maine author Tess Gerritsen, author of the best-selling, Boston-based “Rizzoli & Isles” series that’s now a show on TNT, is suing Warner Bros. for an estimated $10 million in damages, claiming the Oscar-winning film “Gravity” is based on her book of the same name. Gerritsen sold film rights to her novel “Gravity” to Katja Motion Picture Corp./New Line Productions in 1999, according to a press release from Gerritsen’s publicist. Warner Bros. is the parent company of New Line and Katja, and says it has no comment on the suit. Gerritsen, who’s represented by California lawyer Glen Kulik, says in her complaint that her novel “Gravity” is about a “female medical doctor/astronaut who is stranded alone aboard a space station after a series of disasters kills the rest of the crew. The book details the astronaut’s struggle to survive.” The movie “Gravity,” which is credited to Alfonso and Jonás Cuarón (Alfonso Cuarón also directed the film), is about a female astronaut (played by Sandra Bullock) who is stranded in space. As soon as news of the lawsuit broke Wednesday morning, film trade publications began referring to an October article in Indiana’s Greencastle Banner-Graphic newspaper in which Gerritsen says, “ ‘Gravity’ is a great film, but it’s not based on my book.” Gerritsen has posted the complaint and her statement on her website.