Monday morning. A man drops dead in the parking lot of a car dealership in downtown Calgary. No one knows where the shot came from. No one knows why the victim was targeted. The shooter? Invisible. An hour later, another body hits the ground. Random victim, random location.A sniper is terrorizing Calgary.Detective Brad Coulter has just returned to work after a long leave of absence. He is thrown directly into the fire and tasked with stopping what is rapidly becoming one of the city's deadliest killers. The shooter leaves no evidence behind but taunts Brad with notes addressed directly to him. As the death count rises, city-wide panic ensues.It is a race against time. But how can Brad hunt a ghost?