All events take place in Africa, in the imaginary kingdom, or perhaps one should say queendom of Mur, ruled by Maqueda, a descendant King Solomon and the Queen of Sheba. This time Rider tells about two more lost tribes of Africa. Due to the contradictions between them, one of them faces death. The ring of Queen Sheba given to Dr. Richard Adams is a sign of well-deserved reward for the salvation of the people and the destruction of the main enemy.