INCLUDING ENHANCED AUDIO FEATURESFormer social worker Elle Castillo is the host of a popular true-crime podcast that tackles cold cases of missing children in her hometown. After four seasons of successful investigations, Elle decides to tackle her white whale: the Countdown Killer, or TCK.Twenty years ago, TCK established a pattern of taking and ritualistically murdering girls, each a year younger than the last. No one’s ever known why—why he stopped abruptly with his elev...

INCLUDING ENHANCED AUDIO FEATURESFormer social worker Elle Castillo is the host of a popular true-crime podcast that tackles cold cases of missing children in her hometown. After four seasons of successful investigations, Elle decides to tackle her white whale: the Countdown Killer, or TCK.Twenty years ago, TCK established a pattern of taking and ritualistically murdering girls, each a year younger than the last. No one’s ever known why—why he stopped abruptly with his eleve...