President Sarejo, the ruler of a small South American country, has come to America for some urgent hospital treatment. He brings with him most of his cabinet so that he can keep an eye on them while away. What with them and the large number of his countrymen protesting outside the hospital there are an awful lot of people who may want him dead.

It isn't him who dies though; first one of his cabinet and then another die of suspected heart attacks.

Asten sends Quincy and Sam, at the request of Archbishop Vallejo, to San Remos, Mexico. They are sent to a small village where a young woman is seemingly curing people of their illnesses. She says that she gained her powers from some bones she found in a cave. Quincy and Sam have to join a group of eminent scientists trying to determine how old the bones are and whether they could possibly belong to a legendary missionary from the time of the Incas.