Dream Police #5

Who exactly are the Dream Police? Where do they come from? How are prospective officers chosen? Those seem like fairly straightforward questions...except that they are cover for a secret that goes back to the beginnings of civilization, a secret that must be protected at all costs, especially from the inquiries of Lieutenant Detective Joe Thursday. Joe has always been a loyal member of the Dream Police...but when his instincts as a cop tell him that the people he's working for are aligning against him, how far will he go to find the truth about them?