Thad opened the exhaust valve, let the air hiss from the chamber of the lock. The huge door swung open in response to his hand upon the wheel, and he entered the cylindrical chamber. In a moment the door was closed behind him, air was hissing into the lock again.

T

He started to open the face-plate of his helmet, longing for a breath of air that did not smell of sweat and stale tobacco smoke, as that in his suit always did, despite the best chemical purifiers. Then he hesitated. Perhaps some deadly gas, from the combustion chambers....

Thad opened the inner valve, and came upon the upper deck of the vessel. A floor ran the full length of the ship, broken with hatches and companionways that gave to the rocket rooms, cargo holds, and quarters for crew and passengers below. There was an enclosed ladder that led to bridge and navigating room in the dome above. The hull formed an arched roof over it.

The deck was deserted, lit only by three dim blue globes, hanging from the curved roof. All seemed in order—the fire-fighting equipment hanging on the walls, and the huge metal patches and welding equipment for repairing breaks in the hull. Everything was clean, bright with polish or new paint.

And all was very still. The silence held a vague, brooding threat that frightened Thad, made him wish for a moment that he was back upon his rugged ball of metal. But he banished his fear, and strode down the deck.

Midway of it he found a dark stain upon the clean metal. The black of long-dried blood. A few tattered scraps of cloth beside it. No more than bloody rags. And a heavy meat cleaver, half hidden beneath a bit of darkened fabric.

Mute record of tragedy! Thad strove to read it. Had a man fought here and been killed? It must have been a struggle of peculiar violence, to judge by the dark spattered stains, and the indescribable condition of the remnants of clothing. But what had he fought? Another man, or some thing? And what had become of victor and vanquished?

He walked on down the deck.

The torturing silence was broken by the abrupt patter of quick little footsteps behind him. He turned quickly, nervously, with a hand going instinctively to his welding arc, which, he knew, would make a fairly effective weapon.

It was merely a dog. A little dog, yellow, nondescript, pathetically delighted. With a sharp, eager bark, it leaped up at 

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