After intrepid working girl Mary Carter (Paulette Goddard) becomes the new owner of a reputedly haunted mansion located on Black Island near the Cuban coast, a stranger (Anthony Quinn) phones to warn her to stay away from the castle. Undaunted, Mary sets sail for Cuba with a stowaway in her trunk -- wise-cracking Larry Lawrence (Bob Hope), a radio announcer who helps Mary get to the bottom of the voodoo magic, zombies and ghosts that supposedly curse the spooky estate.