"Extraordinary . . . A future sci-fi masterwork in a new and welcome tradition." — Joanne Harris, author of Chocolat

A stand-alone science fiction novella from the award-winning, bestselling, critically-acclaimed author of the Wayfarer series.

At the turn of the twenty-second century, scientists make a breakthrough in human spaceflight. Through a revolutionary method known as somaforming, astronauts can survive in hostile environments off Earth using synthetic biological supplementations. They can produce antifreeze in subzero temperatures, absorb radiation and convert it for food, and conveniently adjust to the pull of different gravitational forces. With the fragility of the body no longer a limiting factor, human beings are at last able to journey to neighboring exoplanets long known to harbor life.

A team of these explorers, Ariadne O'Neill and her three crewmates, are hard at work in a planetary system fifteen...