In 1989, a brutally murdered woman is found naked in the Arizona desert—but her identity remains a mystery for 30 years until a detective enters the case into modern databases and discovers she's Marina Ramos, a young mother whose two infant daughters vanished. Now investigators race to identify a man named Fernando David and locate the biological father of one daughter using genetic genealogy, with major breakthroughs in 2025 finally revealing where the girls ended up—but the killer remains at large. A cold case dormant since 1991 was solved through digitization and DNA databases in 2021, leading to the identification of Marina Ramos 32 years after her murder in the Arizona desert.