NEW YORK — Rachel Weisz dazzled in Valentino red at the July 27 premiere of Samuel Goldwyn Films’ “The Whistleblower,” even as she acknowledged her reality-inspired drama lacks an upbeat Hollywood ending.“It’s a true story about an ordinary woman doing extraordinary things, like David and Goliath,” she said of Kathy Bolkovac, the Nebraska cop who in 1999 as part of the U.N. peacekeeping force in Bosnia blew the whistle on sex trafficking among the local police and U.N. forces. “It doesn’t have a happy ending, but I don’t think it’s depressing,” Weisz said. “It’s thrilling, entertaining and inspiring in what she did, and that her story is being told.” “My career was completely ruined by this,” Bolkovac acknowledged on the red carpet, “which is the reason I’m not involved in international law anymore. This film will now bring to light some of those injustices that have never been resolved for the last 10 years, including our own State Department and the U.N. having to face the fact that they need to be accountable not only to these women but to me.” As to what’s scarier — her reality-inspired biopic or haunted house horror film “Dream House” with Daniel Craig that arrives in September — Weisz said, “I don’t think this is really scary; it’s a thriller, and I don’t know how scary the horror movie is. I haven’t seen it yet.” Craig joined her at the Cinema Society event’s afterparty at Jimmy at the James Hotel.