Three thousand years into humanity's journey among the stars, one truth has never been questioned: certainty is the only sin.
Isaac Valdez has spent his whole life in service to that faith, and to his brilliant, dying sister Aurora. She asks. He follows. It is the only shape he has ever known for his own life.
But when Aurora sends him somewhere he was never meant to go, into the ship's forgotten lower decks, Isaac begins to see cracks in everything he has trusted: the faith that raised him, the sister who shaped him, and the man he always assumed himself to be.
As the ship moves toward something none of them are prepared for, Isaac is forced to choose between the questions he was taught to live by and the answers he can no longer ignore.
Not everyone will walk the same path. And Isaac is about to find out which one is his.
A literary science fiction novel about faith, family, and the cost of certainty, for readers who loved the quiet devastation of Station Eleven and the moral weight of The Sparrow.