Approach of an Unknown is set in the present following the life of Gerome striving to venture into space. He pursues education and then engineers and builds his space craft with a close group of friends. A comet is discovered to enter Earth's heliosphere showing signs of intelligent control on course to meet up with Earth. The Mizinians, an alien population fleeing for thousands of years from the destruction of their world, are determined to take the planet for themselves. A world of nations and peoples in conflict with one another against an alien civilization of billions prepared over thousands of years to invade and conquer...