Kathryn Emmente must decide who is friend and who is foe when her spaceship explodes under mysterious circumstances. Many among her crew are killed and the rest are left helpless and stranded on a terra-farming colony moon of Jupiter. They have no means of communicating with Earth or even the nearest stellar platform for aid. Kat soon learns that the detonations aboard her ship and the deaths of her fellow crewmates may not have been as accidental or incidental as they first appeared. She begins to suspect that one among the survivors may be operating on a hidden, sinister agenda—and that she and her young daughter may be the next victims.