An adventurer working for the Museum of High Altitude Archeology in Lima discovers three mummified Incan children high in the Peruvian Andes. Among the artifacts he brings to the Museum are an inscribed Inca sun disc and a number of Inca “aprons” found in the sacrificial burial site. The threads of the aprons are a series of knotted strings, quipu, that tell a coded story that can only be read by touch. A chain of events is unleashed that pits religious fanatics, spies, revolutionaries, and corrupt government officials against scientists and each other in dreams of gold, power, and self-righteousness.