A mystery novelist discovers a plan to murder an American heiress while on vacation in Spain. He enlists the help of a taxi driver to travel across the Spanish countryside in order to thwart the crime. This film used Smell-O-Vision, a new technology that released scents into the movie theater that tied into the story. In fact, the various scents released were integral to the story! Later re-released under the name "Holiday in Spain" with no live scents.