Kara, the last member of a long list of Egyptian rulers, learns from his grandmother upon her deathbed that an Englishman, Lord Roane, had dishonored the daughter of the imperial house, and that in his veins together with the blood of kings flows the blood of the perfidious nobleman. Before passing away she gives to Kara the key to the secret burial vaults and treasure chamber. Kara vows to wreak a belated vengeance upon the head of the man who has sullied his family's honor. He takes with him enough treasures to carry out his purpose, goes to Cairo where he is received as a royal prince, and there finds Lord Roane. With Oriental cunning he sees that he can best pierce his enemy to the heart through the nobleman's beautiful granddaughter, Lady Aneth. He asks her hand in marriage, is refused, but still clings to his purpose. Enticing the girl's father to gamble, he ruins him and then offers to restore the winnings if the Englishman will give his consent.