Written by the author of "Phantom of the Opera," this tale takes us to Peru where Dick Montgomery hopes to marry his fiancé, Maria-Teresa de la Torre, the daughter of a Spanish marquis. Because of their disrespectful manner, Maria-Teresa discharges a group of Quichua Indians working in the household, including Huascar. It is heard that the Indians have found an Incan king and are going to celebrate an ancient ceremony wherein a virgin bride is sacrificed to the Sun King. Maria-Teresa is the chosen victim and is kidnapped. Dick and Maria-Teresa's father attempt to save her, but are unsuccessful. Huascar comes to them, saying he will save Maria-Teresa, but is he to be trusted? Left with no choice, they take Huascar at his word, and the rescue begins.