It is the year 2450. Humans now live up to two hundred years; humanity has reached out into our solar system with a large city on Mars and commercial outposts on Titan and Ceres, four permanent moon bases and a giant space station called Sanctuary. Humankind was on the verge of interstellar space travel and still they had not been contacted by aliens . . . or had they. Two immortal aliens had been guiding humanity since ancient Sumer; one subtle, one not so. The aliens' different beliefs led them into a conflict with each other that ultimately pulled a peaceful human society deep into their...