In the far future, where men are as gods, living lives of perfect peace and prosperity, Phaethon of Rhadamanthus discovers all memory of his lifework has been hidden from him. For he is the engineer of the sole starship his civilization has ever produced: the mighty, majestic, and immense Phoenix Exultant. She is a ship to conquer the stars.

But such ambition is outlawed in utopia. Phaethon is a pariah, exiled mentally and physically, denuded of possessions, and cast down among outcasts. His life is sought by sinister agents of the Silent Oecumene: an apocalyptic menace none but he dares see. For in a world where mind or memory can be edited at will, what is truth?