The later parts of the book describe Jeffson's descent into mad pompousness: adopting Turkish attire, he declares himself monarch and burns down cities (including Paris, Bordeaux, London, and San Francisco) for pleasure. He then commits his life to one task, the construction of a huge and colossal golden palace on the isle of Imbros, which he means to dedicate as an altar to God and a palace to himself. He spends seventeen years on the palace, several times abandoning the work, until its completion, when he recognizes the vanity of it.
While travelling through Constantinople, which he also burns down, he meets a twenty-year-old naked woman who is without the slightest knowledge of anything in the world. She continues to follow him, no matter how he mistreats her. Gradually, he accepts her, but forces her to wear a veil over her mouth. Her speed at learning astonishes him, so he teaches her to speak, read, cook, fish, and dress.