Reviewing a murder from twenty years ago, FBI Special Agent Scott Lynley needs the last person to see the victim alive. Still haunted by her aunt’s death, FBI Victim Specialist Abby Zhang is eager to help. Yet even two decades later, someone is keeping clues hidden, putting Abby in the cross fire of the Kolton Lake killer. Scott’s mission is to solve the case but Abby's quickly becoming his first—and only—priority.