In July of 2023, a beloved elementary school teacher took a walk through her Maryland neighborhood, just as she did every evening. But this time, she never came home. Within days, her disappearance sparked a massive search effort involving local authorities and concerned volunteers alike. As the weeks wore on, eerie details surfaced, including a photograph of the murder suspect as he was disposing of her remains. This is the murder of Mariame Toure Sylla.

In the spring of 2009, a short-lived spree of attacks against women in Boston and Rhode Island had the Eastern Seaboard on edge. But when a suspect was finally identified, the revelation was almost too bizarre to believe: a clean-cut, promising medical student with a seemingly perfect home life. As investigators dug deeper, they uncovered a dual existence darker and more calculated than anyone who knew him could have possibly imagined. These are the crimes of the Craigslist Killer, otherwise known as Philip Markoff.

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.