Satan\'s Blood - 1978

In Madrid, Andres and Ana are happily married and Ana is four-month pregnant. One day, they decide to go for a ride in their car with their dog Blackie. While returning home, they stop at a traffic light and a man in another car says "hi" to Andres. They park their cars and the other driver, Bruno, tells that they where schoolmates and introduces his wife Berta. They invite Andres and Ana to go to their house to drink wine, and they drive to a distant house in the countryside. They have a session of Ouija board when secrets from their past are disclosed. Then there is a storm and Bruno invites the couple to spend the night in his house and return home in the morning. Soon Andres and Ana learn that Bruno and Berta worship the devil and they are trapped in a haunted house.