Parallel Visions: City of Angels City of Demons ebook and trade paperback available on Amazon (or here).
Nova Genesis alternate history
As an alternate history, the Nova Genesis world diverges on February 3rd, 1947 when a (relatively) near Earth supernova wavefront reaches our solar system. If not for the intervention of the Galactics all life on Earth would have been wiped out. The Galactics' neutrino shield, despite a mysterious attempt to sabotage it, prevents the otherwise inevitable and immediate mega-deaths. Enough radiation and neutrinos get through to damage the biosphere, and the Galactics seed the Earth with nano-tech based DNA repair robots. Superhuman mutants begin to appear, and the first generation of superheroes and supervillains takes shape.
Also see: Nova Genesis World timeline