It's a rare day when Terrans meet eye-to-eyestalk with the slimy little sticky-fingers - er, that is to say, the noble alien Groaci. This time the races clash on the planet Popu-Ri, once the home of a mighty interstellar power. Popu-Ri has sunk into decline...but its ancient treasures remain. Though not for long, if the Groaci have their way. Groaci also finds Popu-Ri just the place to build a galactic warfleet. Still, for the Corps Diplomatique Terrestrienne to respond would threaten the delicate balance of human/Groaci forces on the cocktail circuit. Therefore the ambassador must keep the lid on by doing nothing. But how to do nothing without seeming an inneffectual pantywaist? Send an observer! Yep, the Ambassador has it all figured out. But he made one little mistake; he sent Retief...

The twenty-seventh century planet of Quopp is a world where Earthmen walk cautiously or not at all. The inhabitants are weirdly diabolical creatures, possessing spoked-wheel limbs and sprouting steel-sharp talons. Plans are afoot to place these singular beings under a single government friendly to Earth. But Jame Retief, officer of the distinguished Corps Diplomatique Teresstienne, a supra-national organization devoted to keeping the peace, has discovered that evil forces are undermining the whole scheme. Deviously sincere, uncompromisingly venal, fearlessly cowardly, Retief goes to work against mounting planetary intrigue and more than once brings those around him to the brink of nervous collapse.

Awakened from suspended animation aboard his exploration starship, John Jackson is shocked to discover that the ship never left Earth - and that he has slept a century after a world war. Facing a nightmare wilderness inhabited by neo-barbarians and sentient tanks, Jackson is the only man who can bring the world to its senses.

Lumbaga is a planet without known virtues - but with some decidedly odd natives. For every Lumbagan is simply an arbitrary assortment of semi-independent organs inspired by a lust for mayhem. But even the most undesirable chunk of galactic real estate attracts its quota of rival overlords, and the fiendish Groaci had a scheme for absorbing Lumbaga into their sphere of influence. It was working well, too, until it involved Retief, Terran diplomat extraordinary. To his powerful intellect, the machinations of the Groaci were child's play...

Mankind was at war with the hideous Gool...and losing. Then, beyond Ganymead, one man fought the searing brain probe of an alien spy...and won. He mastered the power of its telepathic mind-control, captured the secret of its matter transmitters, and learned how to destroy the Gool Overlords. He called intelligence with news of the victory and headed home. Straight into a barrage of Terran nuclear warheads. Past missiles, shells, and assassins, he made it home - alone, badly wounded, and branded a traitor by conventional Terran wisdom that said no one could survive the Gool brain probe. No one, that is, except a brainwashed puppet deliberately allowed to survive to serve the Goos as a spy. But he must survive Earth's attempts to kill him - because no matter how much his fellow humans want him dead, he knows that he is the only one who can lead them against the Gool and have a chance at victory.

When he awakens in a skid row alley, Adam knows nothing. Not who he is, nor where he's from. Money is a mystery. So are women. All he begins his new life with is a will to survive. But he learns fast: first, how to get away; then how not to have to. In the beginning Adam wants to be friends with us. Before he's through he just might run the human race off its feet...

Chester W. Chester IV inherits a run-down mansion and millions in back taxes. In order to pay the taxes, he initially decides to auction off the mansion and its contents, but then he discovers a massive computer (the Generalized Nonlinear Extrapolator, or "Genie") that can bring any situation or time to life.