A raging fire in a national park seems an unlikely setting for a murder, but that's exactly the circumstances that crime-fighting park ranger and medic Anna Pigeon confronts in this mystery thriller. A suspicious fire breaks loose in Northern California's Lassen Volcanic Park and Pigeon assists in battling the blaze and treating the wounds of other fire fighters. As if that's not enough, Pigeon finds herself without food and water trapped with a group of fire fighters, one of whom is a murderer. She tries to figure out who the culprit is before he, or the weather, strikes again.