A missing man. A mysterious computer program - even the people constructing it don’t know what it will do.

Portland, Maine police detective Harvey Larson was good at keeping his personal life out of his professional life. But when he and his partner, Eddie Thibodeau, investigate the disappearance of software designer Nick Dunham, he meets a young woman who will change his life.

Jennifer Wainthrop was the last person to admit seeing Dunham alive. Can Harvey find out what happened to her missing coworker in time to save Jennifer from the same grim fate that claimed Nick?

The killer has learned who is stalking him, and everyone associated with the case is in danger. Harvey struggles for the strength he needs to protect Jennifer. But Jennifer must depend on her own wits and God alone when the killer gets too close.