kept leaping up, whining.

"Hungry, boy?" Thad whispered.

He fumbled in the bulky inside pockets of his suit, found a slab of concentrated food, and tossed it out through the opened panel. The dog sprang upon it, wolfed it eagerly, and came back to his side.

Thad set at once about exploring the ship.

First he ascended the ladder to the bridge. A metal dome covered it, studded with transparent ports. Charts and instruments were in order. And the room was vacant, heavy with the fatal silence of the ship.

Thad had no expert's knowledge of the flier's mechanism. But he had studied interplanetary navigation, to qualify for his license to carry masses of metal under rocket power through the space lanes and into planetary atmospheres. He was sure he could manage the ship if its mechanism were in good order, though he was uncertain of his ability to make any considerable repairs.

T

To his relief, a scrutiny of the dials revealed nothing wrong.

He started the gyro motors, got the great wheels to spinning, and thus stopped the slow, end-over-end turning of the flier. Then he went to the rocket controls, warmed three of the tubes, and set them to firing. The vessel answered readily to her helm. In a few minutes he had the red fleck of Mars over the bow.

"Yes, I can run her, all right," he announced to the dog, which had followed him up the steps, keeping close to his feet. "Don't worry, old boy. We'll be eating a juicy beefsteak together, in a week. At Comet's place in Helion, down by the canal. Not much style—but the eats!

"And now we're going to do a little detective work, and find out what made that disagreeable noise. And what happened to all your fellow-astronauts. Better find out, before it happens to us!"

He shut off the rockets, and climbed down from the bridge again.

When Thad started down the companionway to the officers' quarters, in the central one of the five main compartments of the ship, the dog kept close to his legs, growling, trembling, hackles lifted. Sensing the animal's terror, pitying it for the naked fear in its eyes, Thad wondered what dramas of horror it might have seen.

The cabins of the navigator, calculator, chief technician, and first officer were empty, and forbidding 

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