For decades, Houston police search for a serial killer preying on young women until a local man's DNA finally reveals the culprit. Upon his arrest, the killer's sister and daughter learn his true identity as the Tourniquet Killer.

When a churchgoing family man's second wife is found dead in their hot tub, police look back at the suspicious drowning death of his first wife. After years of believing his father, his youngest son finally learns the horrifying murderous truth.