When the killer is invisible, there's no time to run. Listen carefully for the creature's scream, for it is only warning you'll get. In "The Sound of Horror" (1964), treasure hunters explore the vast caverns of Greece, attempting to unearth a priceless bounty of ancient artifacts. Their archaeological dig turns deadly when an invisible creature with a bloodcurdling shriek is awakened and lashes out with a horrifying vengeance! When two of the treasure seekers are brutally killed and another critically wounded by the uncontrollable beast, they are forced to abandon their quest for riches and desperately fight for their lives. Starring European horror-flick cult favorites Soledad Miranda and Ingrid Pitt.