City of elegance and squalor. Of religious fervor and wanton lusts. And everywhere, on the walls of courtyards and churches, an incandescent fungus of mysterious and ominous origin. In Ambergris, a would-be suitor discovers that a sunlit street can become a killing ground in the blink of an eye. An artist receives an invitation to a beheading—and finds himself enchanted. And a patient in a mental institution is convinced that he’s made up a city called Ambergris, imagined its every last detail, and that he’s really from a place called Chicago . . .

By turns sensuous and terrifying, filled with exotica and eroticism, this interwoven collection of stories, histories, and “eyewitness” reports invokes a universe within a puzzle box where you can lose—and find—yourself again.