A former diver disappears, and his girlfriend is kidnapped. Meanwhile, Jack's daughter wants to move back to Chicago, Sam must choose between Jack and Brian, and Danny and Elena plan to get married that evening.
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.—garykmcd