This terse Austrian drama, an Oscar nominee this year for Best Foreign Language Film, starts off as a lethally honed depiction of life in a brothel. As long as Revanche focuses on the relationship between Tamara (Irina Potapenko), an indentured Ukrainian prostitute, and Alex (Johannes Krisch), the ex-con gofer and would-be tough guy who wants to help her escape, it’s riveting. But then there’s an accidental shooting death, and a countrified cop and his wife enter the picture. The movie turns into a bizarrely ambivalent, drawn-out tale of vengeance: a revenge served so cold that the drama cools off. B?