No Way Out (1987)

"Is it a crime of passion, or an act of treason?"

Navy Lt. Tom Farrell meets a young woman, Susan Atwell, and they share a passionate fling. Farrell then finds out that his superior, Defense Secretary David Brice, is also romantically involved with Atwell. When the young woman turns up dead, Farrell is put in charge of the murder investigation. He begins to uncover shocking clues about the case, but when details of his encounter with Susan surface, he becomes a suspect as well.