
When the Cannon family returns home to New Mexico with their daughter Katie, they find themselves haunted by increasingly disturbing and violent events, all connected to her. Katie alternates between being unresponsive and exhibiting wild, aggressive behavior, suggesting something profoundly changed during the eight years she was held captive in Egypt. As the family, especially Katie’s father who is a journalist, tries to understand what happened to her while she was missing, their relationships begin to fall apart under the strain of her growing evil. The terrifying events build to a shocking climax, revealing the source of Katie’s condition.