John Brunner 
Stone That Never Came Down [EPUB ebook] 

“A world on the brink of war . . . Credible characters, suspenseful plotting and Brunner’s broad vision make this humane novel a winner” (Kirkus Reviews). The world is awash in civic decay, military coups and revolutionary governments, bands of believers ('Godheads') roaming the streets and turning plastic crosses into assault weapons. One scientist has discovered a new kind of viral drug, VC, which has the power to drastically alter the human mind. It could save civilization but at what cost? And who has the right to make a decision about whether or not to use it? Brunner at his thought-provoking, action-packed best.  “One of the most important science fiction authors. Brunner held a mirror up to reflect our foibles because he wanted to save us from ourselves.” —SF Site