The American spaceship captain's mysterious daughter, Neelam, whom he had illegally stowed away with him on his journey to Mars, joins two alien teenagers in their battle to free themselves from the thought control of a mysterious power on their planet.<P>The group controlling that Power have found means to make themselves immortal. They are not worried about the rebellion. They've made it impossible for anyone to leave the planet. Anyone who tries, gets burned. And they control the planet's getting-ready-togo-nova sun. To them total destruction of the "tainted blood" is the only thing that counts.