In the distant future, corporations have become sustainable communities with their own militaries, and corporate goals have essentially replaced political ideology. On a youthful, rebellious impulse, Lawrence joined the military of a corporation that he now recognizes to be ruthless and exploitative. His only hope for escape is to earn enough money to buy his place in a better corporation.

When Rab was a baby, his mother made a decision which would change his life. She feared he would be sent to work in the hellish mines of Mercury, to eke out his life until he was worn out, all in the name of maintaining the defense of the Solar System. But when her desperate attempt to flee with her 2 year old failed, she took a desperate step to save him. She cut off his hand. Decades later, Rab has been spared the physical hardships he can no longer endure, and is now based on the Mask, the all-encompassing structure which hides the Solar System from alien eyes.

By the middle of the 21st century, humanity has managed to overcome a series of catastrophic events and maintain some sense of stability. Space exploration has begun again. Science has led the way. But then one day, the sun goes out. Solar panels are useless, and the world begins to freeze. Earth begins to fall out of its orbit. The end is nigh. Someone has sent us a sign.

The very far future: The galaxy is a drifting wreck of black holes, neutron stars, and chill white dwarfs. The age of star formation is long past. Yet there is life here, feeding off the energies of the stellar remnants, and there is mind, a tremendous galaxy-spanning intelligence each of whose thoughts lasts a hundred thousand years. And this mind cradles memories of a long-gone age when a more compact universe was full of light... The 27th century: Proxima Centauri, an undistinguished red dwarf star, is the nearest star to our sun. How would it be to live on such a world?

"Who's There?" was first published in the November 1958 issue of New Worlds. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.