Isaac Asimov 
Currents of Space [EPUB ebook] 

A nova-bright adventure and the spectacular precursor to the classic Foundation series by a founding father of science fiction.The fate of the galaxy hangs in the balance.High above the planet Florina, the Squires of Sark live in unimaginable wealth and comfort. Down in the eternal spring of its surface, however, the native Florinians labour ceaselessly for their Sarkite masters. Rebellion is unthinkable and impossible. But now both worlds are hurtling toward a cataclysm, and only one man knows the truth; a man without a memory or a past, unaware of the secret locked inside his own brain…Their world is doomed.