In Pontiac, Michigan, in 2017, 22-year-old Rosalia Brantley goes missing after attending a birthday party followed by a night out dancing at a club with friends. Two days later, her lifeless body is found dumped in a city park. When police fail to find any viable suspects, or even the location where the crime took place, the case goes stone cold for almost 20 years. A tip from an unlikely source causes a group of retired investigators to re-open the case. But will they be able to answer the question that stumped so many detectives before them: Who killed Rosalia Brantley?