Greylorn (version 2)
Author: first_name: Keith
last_name: Laumer
Language: English
Year: 1968

Earth is threatened with destruction by a deadly alien plague. The planet’s only hope: Get help from the long-lost Omega Colony, somewhere in space. The fate of the Earth is in the hands of Lieutenant Commander Greylorn in charge of the search for Omega, and every decision he will make during Man’s first contact with an alien race... (Summary by Mark Nelson)