When Ian Norville disappears on a field trip to a museum in Manhattan, the team gets involved, but it isn't long before Jack turns his suspicion to his father, Daniel, who soon admits that he didn't take the necessary precautions with his son, who happens to be autistic.

Max Cassidy vanishes after leaving a message on his wife's voicemail, with both Jack and Ann frantic to find him. While investigating, Jack realises that Max was having an affair, and that he's gotten much deeper into a case than he should have following the murder of his partner, Jimmy, a man Max had felt was too green for undercover work. Both Jack and Ann fear the worst as the team tries to hunt down Max.