The Ortholan’s crew barely survive their crash on an icy moon, and they owe their narrow escape to the least popular member of their crew, the Navigator, whom they call Blue. But they will need him again if they are to survive, because he is the only person aboard capable of flying the ship back to civilization. Unfortunately, without access to their medication, Navigators become somewhat unstable, and the crew’s only hope of salvation may well be the one who kills them all.