In the midst of war-torn Paris, Dr. Ravic (Charles Boyer), a Czech doctor with a score to settle against Nazi officer Haake (Charles Laughton), finds himself entangled in a doomed affair with Joan Madou (Ingrid Bergman), a woman who has known tragedy. As their love blossoms, they are both forced to confront the harsh realities of war and persecution. Against the backdrop of Nazi occupation and growing tensions leading up to World War II, Ravic must balance his thirst for revenge against Haake with his love for Joan, while she struggles to come to terms with her own vulnerabilities.