The FBI investigates the disappearance of Derek Wilson who vanished after hiring a boat to take him to precise coordinates. He co-owns a sporting goods shop but is also a professional scuba diver. He had received a phone call the afternoon before his disappearance while picnicking in the park with his girlfriend Robin Feretti and her young son Travis and quickly left. The site where Kevin went diving reveals three bodies wearing cement overshoes. When Jack and Elena go to interview Robin, they find Travis hiding in the closet and it seems his mother has been kidnapped. It seems that an old friend of Derek's, Edgar Campbell, needs his services and is prepared to go to extreme lengths to make sure he cooperates. Written by
Did You Know?
According to Anthony LaPaglia
, he sensed this could be the series finale, so he asked the producers, arguing they could do be a better finale. Producers assured him it wasn't the finale. LaPaglia knew about the cancellation visiting Spain to promote the series. See more
When Jack's daughter Hanna talks to Samantha about wanting to move back with her mother in Chicago, she expresses fear that Jack will "go DEFCON Five" when she tells him, meaning going into full wartime posture. In actuality, in Department of Defense terminology, DEFCON Five is the lowest level of military alert and DEFCON One is full wartime posture. See more