Felix is trying to get some sleep in a graveyard, but keeps getting bothered by a ghost. He follows the ghost to the house of an old farmer, and the ghost proceeds to terrorize the old man, and when the farmer calls for help from the police, the ghost terrorizes them, too. Felix, however, suspects something fishy is going on, and with the help of the farmer's donkey, gets to the bottom of things.
After intrepid working girl Mary Carter becomes the new owner of a reputedly haunted mansion located on Black Island near the Cuban coast, a stranger 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, a radio announcer who helps Mary get to the bottom of the voodoo magic, zombies and ghosts that supposedly curse the spooky estate.