Set in a leper colony in the north of Iran, The House is Black juxtaposes "ugliness," of which there is much in the world as stated in the opening scenes, with religion and gratitude.

During the 12th Century a boy is born to a tribal chief. He is named Temujin, which means "blacksmith." Nine years later, his father is murdered by the Tartars After a long struggle, just when Temujin reclaims tribal chief status, the Merkit tribe kidnaps his wife. In order to fight against the Merkits, Temujin has to use his mother as a pawn in exchange for troops from ally tribes. Temujin manages to rescue his wife only to realise that she is pregnant with the enemy's child. Enduring tremendous anguish, Temujin throws himself into battle against the Tartars and slaughters the leader of the intruders. He eventually takes his wife back and accepts her child. Later on, he begins a campaign to unify all Mongolian tribes. By the age of 40, he is bestowed the title "Genghis Khan", which means "oceanic ruler".