Some things are sealed for a reason. Forensic psychologist Annie Hunter hosts a holiday bash at her Outer Banks home. A dangerous man with a lot to lose is watching. When Annie looks for a letter once hidden in the house, she turns up links between missing couples and a serial killer's confession. She fears her father has covered up a crime. The killer's daughter seeks Annie's help, but an FBI agent warns her away. Undeterred, she visits the prison to meet the man. He hints at a "headmaster's" plan that fingers her father. Determined to prove this wrong, Annie walks into a trap. Only a precisely calculated plan by her team can help her escape.