In Humble, Texas, a frantic 911 caller, 16-year-old Keri Murphy, reports hearing her mother's screams after an intruder entered their home. When first responders arrive, they find Mary Ann Murphy dead after receiving more than 70 stab wounds. What happened on that dark summer night?

In 2013, Desiree Sunford is found murdered in her Yakima, Washington, home. The case, which begins with what seems to be a simple burglary, spirals into a complex investigation exposing a tangled web of betrayal, deception, and fatal obsession.

College student Anita Knutson is found stabbed to death. The case took years and the unwavering commitment of loved ones and investigators to reach a resolution.