After a catastrophic accident destroys both his revolutionary engine and half of his flight crew, Aurora Aerospace Director Sam Graefe faces the loss of his mission, the loss of his private funding, and serious jail time. Now the only hope for a private American space program lie with an octogenarian nuclear rocket scientist, and his brilliant but erratic grandson. Working together under enormous pressure, they decide to bet the farm on a last-minute mission to the most dangerous place known to man: Jupiter.