"Z-40 is an exceptionally fine bit of property. It is commodious; about twenty miles in diameter. Its internal heat is such that it has a delightful climate in spite of the extreme rarity of atmosphere common to even the best of asteroids. It has a small lake; in fact it has about everything a man could want. Yet, as I said, it is uninhabitable." His voice sank still lower. "You see, sir, there's already a tenant on that sphere, a tenant that was in possession long before the Celestial Developments Company was organized. And it's a tenant that can't be bought off or reasoned with. It's some sort of beast, powerful, ferocious, that makes it certain death for a man to try to land there." "A beast?" echoed Harley. "What kind of a beast?" "We don't know. In fact we hardly even know what it looks like. But from what little has been seen of it, it's clear that it is like no other specimen known to universal science. It's something enormous, some freak of animal creation that seems invulnerable to man's smaller weapons. And that is why we can't offer the place for sale. It would be suicide for anyone to try to make a home there." "_Has_ anyone ever tried it?" asked Harley. "Any competent adventurer, I mean?" "Yes. Twice we sold Z-40 before we realized that there was something terribly wrong with it. Both buyers were hardy, intrepid men. The first was never heard of after thirty-six hours on the asteroid. The second man managed to escape in his Blinco Dart, and came back to Earth to tell of a vast creature that had attacked him during one of the three-hour nights. His hair was white from the sight of it, and he's still in a sanitarium, slowly recovering from the nervous shock." Harley frowned thoughtfully. "If this thing is more than a match for one man, why don't you send an armed band with heavy atomic guns and clear the asteroid by main force?" "My dear sir, don't you suppose we've tried that? Twice we sent expensive expeditions to Z-40 to blow the animal off the face of the sphere, but neither expedition was able to find the thing, whatever it is. Possibly it has intelligence enough to hide if faced by overwhelming force. When the second expedition failed, we gave it up. Poor business to go further. Already, Z-40 has cost us more than we could clear from the sale of half a dozen planetoids." For a long time Harley was silent. The Company was a hard headed, cold blooded concern. Anything that kept them from selling an asteroid must be terrible indeed. His jaw set in a hard line. "You've been honest with me," he said at length. "I appreciate it. Just the same--I still want to buy Z-40. Maybe I can oust the present tenant. I'm pretty good with a ray-pistol." "It would be poor policy for us to sell the asteroid. We don't want to become known as a firm that trades in globes on which it is fatal to land." "Surely my fate is none of your worry?" urged Harley. "The asteroid," began the executive with an air of finality, "is not for--"