Pablo and Luisita, a young married couple, work in Madrid's subway. Their schedules do not allow them to see each other, so they go to Germany in search of another job. The only one they manage to find is as servants in the castle of the sinister Baron Rossenthal. After a few days of acclimatization, the Baron's sister believes that the time has come to suck the blood of the Spanish, although, like good Spaniards, their love of garlic will help them stop the fangs of the avid blood drinkers.