In February 1977, Teresita Basa was found murdered in her Chicago apartment, her killer unknown and the case going cold for months. Then a coworker began entering trances, speaking in a voice that claimed to be Basa's, naming a suspect, and describing stolen jewelry that investigators later found exactly where the voice said it would be. This is the story of a possession that solved a homicide, and the question nobody in law enforcement has ever been able to fully answer: how did she know?