Six months ago, museum curator Deborah Miller had never heard of Ek Balam, an obscure Mayan archaeological site known for its carved figures. Now here she is, having traded Atlanta's urban jungle for a remote village in Mexico's Yucatan, tasked with overseeing Ek Balam's excavation. But when a sudden rainstorm causes a partial collapse at the site, an unexpected treasure is unearthed: a collection of rough-cut rubies hidden from the world for hundreds...