In 1946, Mr. Wilson (Edward G. Robinson) of the United Nations War Crimes Commission is hunting for Nazi fugitive Franz Kindler (Orson Welles), a war criminal who has erased all evidence which might identify him. He has assumed a new identity, Charles Rankin, and has become a prep school teacher in a small town in the United States. He has married Mary Longstreet (Loretta Young), daughter of Supreme Court Justice Adam Longstreet (Philip Merivale).
Wilson releases Kindler's former associate Meinike (Konstantin Shayne), hoping the man will lead him to Kindler. Wilson follows Meinike to the town of Harper, Connecticut, but loses him before he meets with Kindler. When Kindler/Rankin and Meinike do meet, Meinike, who is repentant, begs Kindler to confess his crimes. Instead, Kindler strangles Meinike, who might expose him.
Eventually, Wilson deduces that Rankin is Kindler, but not having witnessed the meeting with Meinike, he has no proof. Only Mrs. Rankin knows that Meinike came to meet her husband. To get her to admit this, Wilson must convince her that her husband is a criminal - before Rankin decides to eliminate the threat to him by killing her. Wikipedia
Edward G. Robinson