A race called the Kiri are pacifists who do not go armed in any circumstance but try diplomatic solutions of any conflict between them and any potential enemies. They sent out a diplomat ship to try and reason with the Rillians, a race that delights in wars and defeating any race they encounter to enslave them. Destroying the diplomat ship rather than speak a single word to the Kiri, they rejoice in their foul deed. Then they discover that there was a survivor and that through space and time he has landed on our inhabited moon. Immediately they send out a soldier who has the armament to destroy the entire moon - and things really get hectic from that point. Fact paced action makes this thriller an enjoyable book to read.