Harbinger.

A lifetime of seeing the murdered dead has led Sullivan Gray into a shaky truce with fear-until the ghost of a terrified man and the traumatic death of a friend shatter everything. When Sully's boss Betty is fatally shot, he becomes the main suspect in the homicide. But he's got other problems. Betty's ghost is guarding a secret, and a guilt-ridden Sully suspects uncovering it is the only way to guide either of them to peace. The terror-stricken...