The Stranger (1946)
Wilson of the War Crimes Commission is seeking Franz Kindler, mastermind of the Holocaust, who has effectively erased his identity. Wilson releases Kindler's former comrade Meinike and follows him to Harper, Connecticut, where he is killed before he can identify Kindler. Now Wilson's only clue is Kindler's fascination with antique clocks; but, though Kindler seems secure in his new identity, he feels his past closing in.
The tranquility of a small town is marred only by sheriff Tod Shaw's unsuccessful courtship of widow Ellen Benson, a pacifist who can't abide guns and those who use them. But violence descends on Ellen's household willy-nilly when the U.S. President passes through town... and slightly psycho hired assassin John Baron finds the Benson home ideal for an ambush.