Father Gabriel ascends the mountains of Brazil to bring christianity to the natives. He is successful and brings about a golden age among them. Mendoza, a slaver, kills his brother in a fit of rage, and only Fr. Gabriel's guidance prevents his suicide.

Gabriel brings Mendoza to work at his mission with the natives, and Mendoza finds peace and asks to become a priest. The church , under pressure, cedes the land to the Portuguese which will allow slavers in again. Mendoza breaks his vows and organizes the natives to resist while Gabriel warns him to help them as a priest.