Al Lancaster narrowly escapes death by laser at the opening of a memory crystal library on Thixen only to discover that a greedy Alien has unleashed a 'mind virus' that turns people who use memcrystals into violent psychotics! Then his lifemate Delo the cat-woman and their Dino babies are nearly killed by the mind virus crime syndicate. Al and Delo vow an Honor Hunt to eliminate the Alien who threatens the lives of everyone in Markan star system, but Al's Guild of Assassins will not help in his Hunt. Armed with a sono-sword and a dreadnought starship, Al faces an ultimate battle against the praying mantis-like Ketchetkeel Aliens who are somehow linked to the mind virus. He may die. Delo may die. But the mind virus must be killed before the A.I. algors in Markan eliminate every lifeform as a means of protecting themselves from insanity infection! This is Book 2 in the Assassin series of stories about Al Lancaster, a solo Human fighting to survive among thousands of Aliens. Book 1 is Stellar Assassin. Book 3 will be Human Assassin.