On Halloween night in 2009, 38-year-old D.C. restaurateur and salsa queen Nori Amaya went out dancing, came home alone, and was found strangled in her bed two days later. Police have DNA and hours of surveillance footage, but in a building full of people in Halloween masks, they’ve never been able to identify her killer. Sixteen years later, the key to solving this case could be a secret someone in Nori’s world is still keeping, or something that went missing from her apartment the night she died.