Two labor leaders are fighting for votes from the farm workers in the Los Angeles area. When a young union worker dies, seemingly committing suicide by carbon monoxide poisoning, both leaders come under suspicion. Even more so when Quincy announces in a press conference that he is not convinced that it was suicide, and that it may have been murder.

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.