Reinhart, senior member of the jewelry firm of Reinhart and Du Boise, is found murdered in the store. Du Boise is suspected, as the partners' relations had been strained, and Reinhart had forced his daughter Amy to break her engagement to Du Boise. Amy, however, believes that he is innocent. She observes that a case of turquoises has been taken, and also notices a quantity of coarse black hair, evidently torn from the head of the murderer. Amy learns that the turquoise mine had been taken over from New Mexican Indians, not without some friction. A clerk testifies that on the day of the murder a well-dressed "Spaniard" had visited the store and bought a few small turquoises. The girl enlists the co-operation of the sheriff, and they go with a posse to the mine. There the Indians are surprised in the midst of tribal ceremonies in which the stolen turquoise plays an important part. Lubo, their leader, in attempting to escape, is mortally wounded. Dying, he confesses to Amy that he murdered Reinhart. Amy reaches the courtroom just in time to present Lubo's written confession which saves her lover from the chair.