The River Is Dark

In a small town along the Mississippi River, separate but nearly identical attacks have left two married couples brutally murdered in their homes. A young boy—the lone survivor of the killings—now lies comatose in the hospital. And the police’s only lead is the boy’s terrified description of the assailant: a “monster.”

Enter former homicide detective Liam Dempsey, whose estranged brother fell victim to the killer. Dragged into the investigation as a suspect, Dempsey vows to solve the case an...