Rogue in Space
Fredric Brown
 In the book a sentient and powerful asteroid arrives in the solar system's asteroid belt after countless aeons of wandering interstellar space. Passing by another asteroid, the living asteroid makes its first ever encounter with other living beings - a likeable criminal involved in a life-and-death struggle with a corrupt and power-mad judge. The judge is eventually killed, but so too is his beautiful wife who had allied herself with the criminal, the couple falling in love. Whilst the god-like living asteroid builds a new world around itself, and blocks all mankind's efforts to investigate it, eventually the criminal returns to the planet with a small group. The sentient asteroid allows them to make planetfall, but only the criminal can accept living in the new Eden created for him, and they eventually depart. The alien then resurrects the late judge's wife.