The Guard ship Custis arrives to retrieve the derelict Anderson from the boulder-strewn emptiness known as Tethys LaGrange Point Four, to discover that the body of a known fatality has vanished from the abandoned craft. The search for the missing crewman expands, and soon ties the fate of the Anderson to that of a ship that vanished twelve years before. Searching for answers, Guardsman Alejandro Detweiler begins an adventure that will lead him from Saturn's Rings to its outermost moons, and take him from the lowest levels of Saturn society to its greatest heights.