In early 18th-century Lisbon, Baltasar, a soldier who has lost his left hand in battle, falls in love with Blimunda, a young girl with visionary powers. From the day that he follows her home from the auto-da-fe where her mother is burned at the stake, the two are bound body and soul by love of an unassailable strength. A third party shares their supper that evening: Padre Bartolomeu Lourenco, whose fantasy is to invent a flying machine. As the Crown and the Church clash, they purse his impossible, not to mention heretical, dream of flight.