Merritt Blake is an architect from the United States who is invited to work on a project in Spain. Since he cannot speak Spanish, Blake is in need of an interpreter, and he hires Mari Zarubia, a beautiful Spanish woman, to serve as his translator. Zarubia's boyfriend, Antonio, does not trust Blake, and follow him as he travels the countryside with Zarubia, convinced he intends to steal his woman away. Antonio's paranoia becomes a self-fulfilling prophecy when Blake and Zarubia find themselves falling in love, which only feeds his violent jealousy.