Chris Fellowes' family history of war heroism has been called into question, threatening to end his father's career. It's up to Chris to prove the truth, so he enlists the help of Lilly Collins, a university researcher, to help find evidence that his great grandfather destroyed a German submarine during WWII. Chris is strongly attracted to Lilly, but a previous bad marriage makes her slow to yield to romance. They travel to Britain, Europe, and Canada to research the truth. As they learn more about the events of the past, passion begins to burn. But as they discover more about the submarine, crew, and action, their feelings about what they find threaten to tear them apart.