Sebastian Ryan, a risk analyst, has disappeared. Emma Caldridge saved him once, and in a moment of foresight he's left a note asking her to save him again. And she knows where to look. Driving into Sunrise City, Utah, a town controlled by a fundamentalist cult, she's already picked up a tail—from the local sheriff. As Emma begins to track Ryan's kidnappers, she learns that Sunrise City's outwardly pious appearance hides a dark secret, and when she derails an unspeakable ritual, she sets the entire town against her.