How do you define justice?

Detectives Angela Baxter and Max Gruber have a problem. When 38-year-old Maggie Dalrymple was found dead at the bottom of a ravine by her ex-husband, they thought they had an open-and-shut case against him. But the more they dig, the less things make sense, and the bodies are stacking up. Can they stop a serial killer before he strikes again?