The ultimate source of clean, renewable energy isn't solar. wind or geothermal and it already produces 20% of all the electricity used on earth. It is gravity. Falling water powers every hydroelectric plant. It doesn't consume or convert matter. It doesn't generate any harmful by-products No fuel, no moving parts, completely silent. Yet it keeps the universe in balance. Simple But what happens when two men unlock the means to control gravity. Virtually limitless, cheap, clean power... The gravity of their stuation increases exponentially. Ultimately- "G" is a story about power.