This exuberantly creepy mash-up of Jewish folklore, J-horror atmospherics, and demonic possession boilerplate might have fared better with critics had writer-director David S. Goyer not gone overboard with references to Dr. Josef Mengele and his sadistic Auschwitz experiments on identical twins. Issues of Holocaust exploitation aside, the movie is a proficient creepshow spiked with sly quotes from past schlock classics and dry humor related to its substitution of a mild-mannered reform rabbi (Gary Oldman) for the usual grizzled Jesuit. Willowy Odette Yustman looks great in her underwear and otherwise gets by just fine as a Chicago teen whose nightmares and hallucinations bespeak dark family secrets. PG-13, 87 min.