Two co-workers in a music shop dislike one another during business hours but unwittingly carry on an anonymous romance through the mail.
Raoul Leduc is a police inspector trailing a spy who plots to kidnap an important American atomic scientist. Joe Victor a gangster who is hired to carry out the abduction, balks when he learns what is at stake and helps Leduc out instead.
A greasy spoon diner provides a base for a spy smuggling nuclear secrets.
