If, as some critics have claimed, The Cabin in the Woods made the horror genre obsolete, someone forgot to tell screenwriter Oren Peli. The Paranormal Activity auteur is having none of your sly postmodern chicanery; he’s content here to vaguely sketch a cast of young people and set them loose like rats in a maze. The maze is Pripyat, the radioactive city next to the Chernobyl nuclear reactor, and the maze is laden with traps Director Bradley Parker shakes his camera around a lot. By the end, it’s we in the audience who feel like test subjects, relenting to an unwelcome examination of the flinch reflex.