Just when the crew of the Sundog thought they'd made it through the most dangerous edge of space - they are taken by a faction of mysterious new Nones to an even further and more deadly place: The Point of No Return. As revolution looms, these Siblings of Rebirth have an unthinkable mission to carry out, and they can't do it without Vess... or with Grix in the picture. But who can be trusted? And will Vess choose destruction... or love?