Raymond receives a letter from his brother, Dudley, telling of his finding an old Aztec Temple. He leaves his brother’s baby, Myrtle, with her aunt Mildred, and with his wife and child, goes in search of the ancient treasures. Raymond finds the Temple and gets imprisoned therein by the falling of a pillar upon his leg. When he manages to get it off, he finds that the party have all been murdered, Including his wife. He becomes a maniac and returning to the Temple he lives there, obtaining food and drink from the Sioux Indians, who believe him to be a White Spirit. His little four year old boy is found, uninjured, by Big Cloud, the chief of the Sioux, who brings the boy up to believe he is an Indian and names him White Eagle. Eighteen years later. Myrtle learns of the tragedy from her aunt, and with a letter to the commander of a frontier fort she obtains an escort and goes in search of the treasure temple and of news of her kinsfolk. She and others find White Eagle, who has been treacherously shot and left for dead by the Apache chief, Wolf, following a peace conference. Myrtle takes a great interest in him, to the anger of young Lieutenant Gray, who has been placed in charge of the escort and who has fallen in love with her. Myrtle does not believe White Eagle to be an Indian, and the frequent meetings of the two and Myrtle’s derisive refusal of the lieutenant’s offer of marriage make him desperate and fill him with a desire for revenge. He comes across Chief Wolf and makes a compact with him whereby he agrees to steal the ammunition so that the Apaches may attack with success and with the agreement that Myrtle is not harmed is handed over to him. The Sioux Chief, Big Cloud, alarmed at the absence of his beloved White Eagle, and seeing a vision of his son being attacked, calls his braves together and they set out to search for White Eagle. They are in time to rescue Myrtle and her party, including White Eagle. Big Cloud invites them to stay a while in their camp and the pipe of peace is smoked. A messenger is sent back to the fort to report the disturbance. The lieutenant is again repulsed by Myrtle and he again seeks out Wolf and his Apaches. Wolf kills Big Cloud, believing him to be White Eagle, the latter rides out with his Indians to exterminate them. The Apaches hide and ride back to kill the hated whites, who escape to the Aztec Temple, which Myrtle has found by following Raymond. The Apaches attack and many are blown to pieces by the maniac Raymond. The identity of White Eagle is established and he and Myrtle are happily united.