In the summer of 2019, a devoted father in Gilbert, Arizona begins to notice that something is deeply, disturbingly wrong with his wife. What starts as a slow drift toward fringe religious beliefs has quietly escalated into something far more alarming — and the people closest to her are only beginning to understand the extent of it.

As her husband desperately searches for someone, anyone, who can help, a shadowy figure in Idaho is whispering in her ear, reshaping her reality, and making plans of his own.

By the time the warning signs become impossible to ignore, it may already be too late.