In 2019, humanity finally finds proof of extraterrestrial life when a listening post in Puerto Rico picks up exquisite singing from a planet that will come to be known as Rakhat. While United Nations diplomats endlessly debate a possible first contact mission, the Society of Jesus quietly organizes an eight-person scientific expedition of its own. What the Jesuits find is a world so beyond comprehension that it will lead them to question what it means to be human.

The sole survivor of a crew sent to explore a new planet, Jesuit priest Emilio Sandoz discovers an alien civilization that raises questions about the very essence of humanity, an encounter that leads Sandoz to a public inquisition and the destruction of his faith.