瑞秋（安娜·钱斯勒 Anna Chancellor 饰）是一位富有而善良的女性，收养了五个孩子。一天，她被人发现在自己家中遭到了谋杀，警方在犯罪现场找到了她的其中一名养子杰克（安东尼·鲍伊 Anthony Boyle 饰）的指纹，杰克被视为最大嫌疑人，遭到了逮捕。可是，就在庭审即将开始之际，杰克在狱中死于一场意外，这宗案件就以杰克是凶手为结果就此盖棺定论。
一晃眼十八个月过去，当瑞秋的丈夫里昂（比尔·奈伊 Bill Nighy 饰）即将和他的未婚妻携手步入婚姻殿堂之际，一位名为亚瑟（卢克·崔德威 Luke Treadaway 饰）的男子出现在了他们面前，并且带来了一个爆炸性的消息——杀死瑞秋的凶手并非杰克，而是另有他人。
Anna Pigeon is a former city slicker who became a park ranger after a devastating loss changed the trajectory of her life forever. While Anna tries to outrun her demons, her focus turns to solving crimes that have taken place within national park grounds, no matter who or what gets in her way.
The series is based on the novels by Nevada Barr.
