Stone

Sprung from a prison in the center of a star, the universe's last criminal is employed to kill the entire population of a planet--and leave the planet itself intact. It is a crime that will tear apart an interstellar utopia that has existed for centuries. To keep ahead of detection while the crime is prepared, the killer voyages to the worlds where, in exotic and varied landscapes, mankind searches for the excitement of a new experience And all the while, the killer is re-awaking the instincts required for murder.