'The Stranger' (1946), staring Orson Welles, Edward G. Robinson, Loretta Young, Konstantin Shayne.
A Rotten Tomatoes comment declared this film to be a 'gooseflesh raiser.' It's a classic film noir who-done-it, woven with mystery and treachery through out.
An investigator named Wilson (expertly played by E.G. Robinson) from the War Crimes Commission travels to Connecticut to find an infamous Nazi (Welles). Welles plays a college professor named Charles Rankin. He lives and teaches in a quiet college town with his lovely wife Mary (Loretta Young).
But Rankin has a grisly secret from his days in Nazi Germany. After the German surrender in 1945, Rankin made his way to the USA where he thought his secret was left behind forever - until his old friend Meineke (Konstantin Shayne) arrives in town. As Wilson snoops about, Mary begins to sense something dreadful about her husband. Tick-tock says the clock. Your time is almost up.
Directed by Orson Welles; Anthony Veiller wrote the screenplay; Produced by Sam Spiegel (S.P. Eagle). Runtime: 95 minutes
Public domain, available on youtub.