“We’re just starting on the first one--Walraven, ship’s communications man,” Costain said, low-voiced. “Captain Maxon and Vaughn have called in. There’s been no word from Ragan.”

Coordinator Erwin took his seat beside the psychologist, his bearing as militarily authoritative in spite of civilian clothing as the room’s air was medical.

“Maybe Ragan won’t turn up,” Erwin said. “Maybe we’ve still got a man out there to bring the ship back.”

Costain made a quieting gesture, his eyes on the three-man psych team grouped about Walraven’s wheeled reclining chair. “They’ve given Walraven a light somnolent. Not enough to put him out, just enough to make him relive the flight in detail. Accurately.”

The lead psych man killed the room’s lighting to a glow. “Lieutenant Walraven, the ship is ready. You are at your post, with Captain Maxon and Lieutenants Vaughn and Ragan. The first Mars flight is about to blast off. How do you feel?”

Walraven lay utterly relaxed, his face dreaming. His voice had the waning sound of a tape running down for lack of power.

“Jumpy,” he said. “But not really afraid. We’re too well conditioned for that, I guess. This is a big thing, an important thing. Exciting.”

It had been exciting at first. The long preparation over, training and study and news interviews and final parties all dreamlike and part of the past. Outside now, invisible but hearteningly present beyond the ship’s impermeable hull, the essential and privileged people waiting to see them off. The ship’s power plant was humming gently like a giant, patient cat.

Captain Maxon passed out muscle-relaxant capsules. The total boneless relaxation that was their defense against acceleration came quickly.

The ship was two hours out, beyond lunar orbit and still accelerating, when, trained for months against the moment, set each about his task. Readings occupied Maxon and Vaughn and Ragan while Walraven checked his communications and telemetering gear.

It was not until the transmitter slot had licked up its first coded tape--no plain text here, security before even safety--and reported all well, the predicted borne out, that they became aware of the Feeling.

The four of them sat in their unsqueaking gimbaled seats and looked at each other, sharing the Feeling and knowing that they shared it, but not why. Vaughn, who was given to poetry and some degree of soul-searching, made the first open recognition.

“There’s something wrong,” he said.

The others agreed and, agreeing, could add nothing of explanation to the wrongness. Time passed while they sat, seeing within themselves for the answer--and if not for answer, at least for identification--but nothing came and nothing changed except that with time the steady pressure of the Feeling grew stronger.

Vaughn, again, was first to react to the pressure. “We’ve got to do something.” He twisted out of his seat and wavered in the small pseudogravity of the ship’s continuing acceleration. “I’ve never in my life felt so desolate, so--”

He stopped. “There aren’t any words,” he said helplessly.

Less articulate than Vaughn and knowing it, the others did not try to help find the words. Only Ragan, professional soldier without family or close tie anywhere in the world, had a suggestion.

“The ship’s power plant is partly psionic,” Ragan said. “I don’t understand the principle, but it’s been drilled into us that no other system can give a one-directional thrust without reaction. The psi-drive is tied into our minds in the same way it’s tied into the atomic and electronic components. It’s part of us and we’re part of it.”

Even Maxon, crew authority on the combination drive, missed his meaning at first.

“If our atomic shielding fails,” Ragan explained, “we’re irradiated. If our psionics bank fails, we may feel anything. Maybe the trouble is there.”

Privately they disagreed, certain that nothing so disquieting as the Feeling that weighted them down could be induced even by so cryptic a marriage of dissimilar principles as made up the ship’s power plant. Still it was a possible avenue of relief.

“It’s worth trying,” Maxon said, and they checked.

And checked, and checked.

“We worked for hours,” Walraven said, “but nothing came of it. None of us, even Maxon, knew enough about the psi-drive to be sure, but we ended up certain that the trouble wasn’t there. It was in us.”

The drug was wearing thin, leaving him pale and shaken. His face had a glisten of sweat under the lowered lights.

The lead psych man chose a hypodermic needle, looked to Erwin and Costain for authority, and administered a second injection.

“You gave up searching,” he said. “What then, Lieutenant?”

“We waited,” Walraven said.

He relaxed, his face smoothing to impersonal detachment as his mind slipped back to the ship and its crew. Watching, Costain felt a sudden deep unease as if the man’s mind had really winged back through time and space and carried a part of his own with it.

“There was only one more possible check,” Walraven said. “We had to wait two days for that.”

The check was Maxon’s idea, simple of execution and unarguable of result. At halfway point acceleration must cease, the ship rotate on its gyros and deceleration set in. There would be a period of waiting when the power plant must be shut off completely.

If the Feeling stemmed from the psi-drive, it would lift then.

It did not lift. They sat weightless and disoriented while the gyros precessed and the ship swung end by end and the steady pressure of the Feeling mounted up and up without relief.