At the turn of the century Théophile and Suzanne Valence sail into the Mexican copper-mining town of Santa Sofìa. Théo has travelled here to build a metal church designed by his mentor, the great engineer Gustave Eiffel. His wife Suzanne, wayward and graced with the gift of clairvoyance is deeply in love and has insisted on accompanying him. But the magical landscape inspires no answering passion in Théo. In her loneliness she turns to the American gold prospector Wilson Pharaoh, and soon he, like the town and its inhabitants, falls under her spell, an enchantment as seductive as Suzanne herself.