When a forensic pathologist enlists the help of a rural sheriff to investigate unusual deaths among older residents, the next death may be her own.

Forensic pathologist Grace Reilly has seen her share of unusual deaths in rural Missouri. But when she begins to notice a curious pattern in autopsies of older residents whose demise appears to be natural, she takes her concerns to Sheriff Nate Cox.

Nate is skeptical about the link Grace is seeing between the deaths—and her suspicions of foul play. But her persistence is compelling. Once she finally convinces him her theory is credible and they join forces to investigate, danger follows. Because exposing the truth could destroy several lives—including Grace’s.