Three days later, Doc saw his first runner.  
The tractor was churning through the sand just before sundown, heading toward another one-night stand at a new village. Lou was driving, while Doc and Jake brooded silently in the back, paying no attention to the colors that were blazoned over the dunes. The cat-and-mouse game was getting to Doc. There was no real assurance that the village they were approaching might not be the target the Lobby had chosen for the next investigation.
 
Lou braked the tractor to a sudden halt, and pointed.
 
A figure was running frantically over one of the low dunes with the little red sun behind him. He seemed headed toward them, but as he drew nearer they could see that he had no definite direction. He simply ran, pumping his legs frantically as if all the devils of hell were after him. His body swayed from side to side in exhaustion, but his arms and legs pumped on.
 
"Stop him!" Jake ordered, and Lou swung the tractor. It halted squarely in the runner's path, and the figure struck against it and toppled.
 
The legs went on pumping, digging into the dirt and gravel, but the man was too far gone to rise. Jake and Lou shoved him through the doors into the tractor and Doc yanked off his aspirator.
 
The man was giving vent to a kind of ululating cry,[Pg 62] weakened now almost to a whine that rose and fell with the motion of his legs. Sweat had once streaked his haggard face, but it was dry and blanched to a pasty gray.
 
Doc injected enough narcotic to quiet a maddened bull. It had no effect, except to upset the rhythm of the arms and legs. It took five more minutes for the man to die.
 
The specks were larger this time—the size of periods in twelve-point type. The lump at the base of the skull was as big as a small hen's egg.
 
"From Edison, like the others so far. Jack Kooley," Jake answered Doc's question. "Durwood spent a lot of time here on his first expedition, so it's getting the worst of it."
 
Doc pulled the aspirator mask back over the man's face and they carried him out and laid him on a low dune. They couldn't risk returning the corpse to its people.
 
This was only the primary circle of infection, direct from Durwood. The second circle could be ten times as large, as the infection spread from one to a few to many. So far it was localized. But it wouldn't stay that way.
 
Doc climbed slowly out of the tractor, lugging his small supplies of equipment, while Jake made arrangements for them to spend the night in a deserted house. But the figure of the runner and his own failures to find more about the disease kept haunting Doc. He began setting up his equipment grimly.
 
"Better get some sleep," Jake suggested. "You're a mite more tired than you think. Anyhow, I thought you told me you couldn't do any more with what you've got."[Pg 63]
 
Feldman looked at the supplies he had spread out, and shook his head wearily. He'd been over every chemical and combination a dozen times, without results that showed in the limited magnification of the optical mike.
 
He snapped the case shut and hit the rude table with the heel of his hand. "There are other supplies. Jake, do you have any signal to get in touch with Molly at the Ryan house?"
 
"Three raps on the rear left window. I'll get Lou."
 
"No!" Doc came to his feet, reaching for his jacket. "They're looking for three men now. It's safer if I go alone—and I'm the only one who knows what supplies are needed. With luck, I may even get the electron mike. Got a gun I can borrow?"
 
Jake found one somewhere, an old revolver with a few loads. He began protesting, but Doc overruled him sharply. Three men could no more fight off the police than one, if they were spotted. He swung toward the tractor.
 
"You'd better start spreading the word on everything we know. If people realize they're already safe or doomed it'll be better than having them going crazy to avoid contagion."
 
"Most of the villages know already," Jake told him. "And damn it, get back here, Doc. If you can't make it, turn tail quick, and we'll think of something else."
 
Southport seemed normal enough as Doc drove through its streets. The stereo house was open, and the little shops were brightly lighted. He stopped once to pull a copy of Southport's little newspaper from a dispenser. All was quiet on its front page, too.
 
As usual, though, the facts were buried inside. The editorial was pouring too much oil on the waters in its[Pg 64] lauding of the role of Medical Lobby on Mars for no apparent reason. The death notices no longer listed the cause of death. Medical knew something was up, at least, and was worried.
 
He parked the tractor behind Chris' house and slipped to the proper window. Everything was seemingly quiet there. At his knock, the shade was drawn back, and he caught a brief glimpse of Molly looking out. A moment later she opened the rear lock to let him into the kitchen.
 
"Shh. She's still up, I think. What can I do, Doc?"
 
He tried to smile at her. "Hide me until it's safe to get into her laboratory. I've got to—"
 
The inner kitchen was kicked open and Chris stood beyond it, holding a cocked gun in her hand.
 
"It took longer than I expected, Dan," she said quietly. "But after your letter, I knew you'd swallow the bait. You bloody fool! Did you really believe I'd start doing research here just because of your imaginings?"
 
He slumped slowly back against the sink. "So this is a fool's errand, then? There never was any equipment here?"
 
"The equipment's here—in my office. I guessed your spies would report it, so it had to be here. But it won't help you now, pariah Feldman!"
 
He came from his braced position against the sink like a spring uncoiling. He expected her to shoot, but hoped the surprise would ruin her aim. Then it was too late, and his boot hit the gun savagely, knocking it from her hand. Life in the villages had hardened him surprisingly. She was comparatively helpless in his hands. A few minutes later, he had her bound securely with surgical tape Molly brought him. She raged furiously in the chair where he'd dumped her, then gave up.[Pg 65]
 
"They'll get you, Daniel Feldman!" Surprisingly, there was no rage in her voice now. "You won't get............