Based upon a review in a film publication, Sari (Dean) is a beggar girl of the streets of Stamboul, near Constantinople, who attracts the attention of Captain Pemberton (Oakman), a soldier of fortune, who has recruited the Black Horse cavalry to maintain law and order. Sari overhears him being told that her soul is as filthy as the streets, so she goes to pray in a mosque although she knows Turkish women are not allowed to enter. There she witnesses a revenge murder by a sheik (Beery), who then attempts to lure her into his harem. She defies him, and he then tries to purchase her. Pemberton returns from the desert and has determined that he loves Sari. The sheik then carries both Pemberton and Sari to his fortified camp outside the city walls. Sari escapes and gets the Black Horse cavalry to attack the camp, resulting in a battle and rescue.
Tod Browning [Public domain], via Wikimedia Commons