Fifty years from now, the sun is dying, and mankind is dying with it. Our last hope: a spaceship and a crew of eight men and women. They carry a device which will breathe new life into the star. But deep into their voyage, out of radio contact with Earth, their mission is starting to unravel. There is an accident, a fatal mistake, and a distress beacon from a spaceship that disappeared seven years earlier. Soon the crew is fighting not only for their lives, but their sanity. Man's last hope lies with a heroic group of eight astronauts and scientists aboard the spaceship Icarus II charged with delivering a stellar fission bomb into the heart of the sun.