In the near future, humans on Earth receive their first evidence of intelligent extraterrestrial life when a radio telescope picks up a strange signal, sounding like exquisite music, from a distant planet that will come to be known as Rakhat. While United Nations diplomats endlessly debate a possible expedition, the Jesuit leadership quietly organizes an eight-person scientific mission of its own, comprised of a variety of disciplines and backgrounds. What they find is a world so far beyond comprehension that it will lead them to challenge the very notions of humanity and faith itself.