The worlds orbiting Cavanagh's Star are in turmoil.Civil war on Umehignited by outsidersthreatens to annihilate the teeming masses of a grossly overpopulated planet. On Bezer'ej, the handful of native aquatic creatures who survived extermination must take extraordinary and terrible steps to ensure the future of their kind . . . And the interlopers from a distant planet called Earth can only watch ...