Random Hearts (1999)

Dutch Van den Broeck, a sergeant in the Internal Affairs Division of the Washington, D.C. police department, and Kay Chandler, a New Hampshire congresswoman running for re-election, know about trust. Their careers depend on it. Their marriages are founded on it. Or so they thought. When a plane crash carrying Dutch's wife Peton and Kay's husband Cullen crashes into Chesapeake Bay, leaving no survivors, it marks just the beginning of a mystery that will not only lead Dutch and Kay to disturbing and shocking information about their spouses, but bring these strangers together in an unlikely romance.