The mummies are today part of the best-known museums in the world, however, these buildings are not their only homes, since in the depths of the earth a city completely populated with mummies continues to exist. Not everything is happiness in this secret place, Princess Nefer is being forced to marry Thut, who does not want the marriage either. Nefer because she wants to live in freedom to explore the world and Thut because she doesn’t want a wife at all. Meanwhile, in the human world, Lord Carnaby finds an Egyptian wedding ring at a dig. Thut will have problems with this and will have to travel to the human world to try to recover the treasure. He won’t do it alone, he will have the help of his twelve-year-old brother, his pet crocodile and Nefer.