In the summer of 1986, two young girls vanished mere months apart, both while out riding their bikes in Tacoma, Washington. Despite exhaustive efforts, both cases went cold, until decades later, when a surprising breakthrough revived the investigation. With new forensic tools and a fresh set of eyes, detectives began to piece together a puzzle that had haunted the community for years, finally finding answers over 30 years later. These are the murders of Michella Welch and Jenni Bastian, otherwise known as the Tacoma Girls.