In 1964, 12-year-old Maddy Reynolds kneeled at her father's grave and promised to follow in his footsteps to become a detective. James Reynolds was murdered while investigating a serial killer case. When Maddy fulfills her pledge in 1978 and becomes the first women detective in an Upstate New York town, what she doesn't realize is the man who is killing young girls in her community murdered her father and has returned for her too.