At the request of the Catholic Church in Lisbon, members of the Royal Archeology and Historical Association of Portugal excavate 78 mummies in a crypt beneath the altar of the Sacramento Church in Lisbon. In the course of excavation the researchers find handwritten books indicating there is a large amount of treasure buried - somewhere - near the mummy crypt. They also discover the exotic history of many of the mummies, including one known as 'The King of the Congo.'