For years the dedicated team of FBI investigators - Senior Agent lack Malone, Samantha Spade, Vivian Johnson, Danny Taylor and Martin Fitzgerald - have cracked New York's toughest missing-persons cases. Now a new agent joins them: Elena Delgado, a former NYPD vice squad officer plunged into the intense 24/7 world of carefully constructed timelines, cross-checked leads, psychological profiling and pulse-racing action. This season people as diverse as an Olympic hopeful, an FBI veteran, a suburban mom and a soldier of fortune with ties to terrorists go missing. Were they murdered? Kidnapped? Suicides? Or did they just walk away from lives too hellish to bear? Join the search!