Chi Chi and his sister Fi Fi are part of a family of giant rabbits. The young rabbits live on a mountain in Bolivia where their ancestors landed with their owners, the Quechua Indians, when they escaped from Machu Picchu as the Spaniards invaded the Inca Empire in Peru. You won't see them on the mountain unless you look very close, but you will hear them giggling. A very old legend tells of their unbelievable size and their truly unusual job, protecting a treasure of gold left behind on the mysterious rocky mountain by their owners of long ago. Every night they sit by their fires, near where they think the treasures are buried. But, one day they hear of a new Light on the mountain that never burns out. Even though Chi Chi and Fi Fi are supposed to stay well hidden during the day, they decide to venture down the mountain to peer in the missionaries' windows. That is when their dangerous adventure begins.