Needle

"I suggest that you do exactly what your father said- go to Dr. Seever."

"But how can we get away with that? He's no dumbbell, and you won't make him believe in miracles. He won't be satisfied just to see one of those holes, either-hell check the whole leg. How will I account for the shape it's in without telling about you?"

"I have been thinking about that. Just what, would you say, is wrong with the idea of telling him about me?"

"I don't want to be written off as cracked, that's what I had trouble enough believing in you myself."

"You'll probably never have better evidence for your story than you have right now, if the doctor is as thorough as you say. I will back you up; and / can prove I am here to anyone's satisfaction, if necessary. I know we have been making strenuous efforts all along to keep my presence secret, and the reasons for that are still sound; I don't mean to broadcast the story. I think, however, that a doctor might be a remarkably good associate in our work. He has knowledge neither of us possesses and should be willing to use it-it is certainly no exaggeration to describe our quarry as a dangerous disease."

"And if he turns out to be the host of our quarry?"

"He is certainly one of the least likely candidates on the island. However, if that should be the case- I think I can find out very quickly and certainly. There is certainly a precaution we can take." He outlined this precaution at length to his host, and Bob nodded slowly in understanding.

The doctor's office was not far from the school. It would hardly have been worth using the bicycle had it not been for Bob's injury. There was a slight delay caused by the presence of another patient, then Bob and his invisible guest entered the pleasant room which Dr. Seever had turned into a consulting room and dispensary.

"Back again so soon, Bob?" greeted the doctor. "Is that sunburn still giving trouble?"

"No, sir, I'd forgotten about that."

"Not entirely, I hope." The two gri

"This is something else. I had a fall in the woods yesterday, and Dad said I'd better either see you or stop limping."

"All right, let's see the damage." Bob seated himself in a chair facing the doctor and rolled up his trouser leg. At first Dr. Seever did not see the exit wound, but after a moment he did. He examined both openings carefully and at considerable length, then he sat back and eyed the boy.

"Let's have the story."

"I was up in the woods, near the head of the first creek. The bank had been undercut farther than I thought, and I broke through, and a sharp-pointed branch underneath went into my leg."

" Through' is the word you want. Go on."

"There's not much else. It hasn't bothered me too much, so I didn't come to you until Dad made me."

"I see." The doctor was silent for another minute or two. Then, "Did something like this happen at school back in the States?"

"We-e-11-" It never occurred to Bob to pretend not to know what the doctor meant "There was this." He extended the arm that had been cut the night the Hunter had made his first attempt at communication. The doctor silently examined the thin, barely visible scar.

"How long ago?"

"Three weeks about." Another period of silence, while Bob wondered what was going on in the other's mind. The Hunter thought he knew.

"You've discovered, then, that there's something unusual about you-something you couldn't understand; something that made injuries which should need stitches behave like scratches and punctures that should put you flat on your back 'not bother you much'; and you've been worried about it? Was that what got into you at school?"

"Not exactly, sir. You're almost right, but-I know what causes it." With the Rubicon crossed, Bob went ahead quickly and clearly with his story, and the doctor listened in rapt silence. At the end he had some questions.

"You have not seen this-Hunter yourself?"

"No. He won't show himself to me. Says it might disturb my emotions."

"I think I can see his point. Do you mind being blindfolded for a little while?" Bob made no objection, and the doctor found a bandage and tied it over his eyes. Then: "Please put your hand-either one-on the table here, palm up; let it relax. Now-Hunter, you understand what I want!"

The Hunter understood clearly enough and acted accordingly. Bob could see nothing, of course, but after a moment he felt a faint weight in the palm of the extended hand. His fingers started to close on it instinctively, and the doctor's hand promptly descended to pin them in place. "Hold on a moment, Bob." For a short time the weight could be detected, then the boy began to doubt whether or not it was actually there-it was rather like a pencil stowed behind the ear, which can be felt after it is gone. When the blindfold was removed, nothing was visible, but the doctor's face was even more sober than before.

"All right, Bob," he said. "Part of your story appears to be true anyway. Now, can you enlarge on this mission of your friend?"

"First, there is something I have to say," replied Bob. "This is really his speech, and I'll try to give it in his own words, as near as I can remember.

"You have been convinced, at least in one essential, of the truth of this story. You must be able to see why the secret has been kept so far and the risk we chose to face in telling you. There is certainly a chance, however small, that you are actually the person harboring our quarry.

"In that event, we see two possibilities. Either you know of his presence and are consciously co-operating with him because he has convinced you of the justice of his position, or you do not know. In the first case, you are now pla

"In the second case, Doctor, your host now knows where I am. He also knows that you are a doctor, and will find some means to detect his presence in your body if anyone can. That, I fear, will mean that we have placed you in danger, for he will have no hesitation in doing whatever he thinks necessary to escape. I ca

"I am sorry to have exposed you to this risk, but it seems to me to be one that falls within your normal duty as a doctor. If, however, you are not willing to take it, simply say so. We will leave at once. We will, of course, test you at the first opportunity; but with the fear of immediate discovery no longer pressing, he may at least leave your body without harming you, since he will be in no hurry. What is your decision?"

Dr. Seever did not hesitate an instant.

"I'll take any risks there may be. I think I can see how to test myself too. According to your story, you have been in Bob's body nearly six months; and your quarry, if he is in mine at all, is likely to have been there for several weeks at least. That is long enough for the formation of specific antibodies-you say you are, in effect, a virus. I can make a serum test with a sample of Bob's blood and my own that should give us an answer at once. Have you learned enough medical English to gather what I mean?"

Bob replied slowly, reading off the Hunter's answer as it came. "I know what you mean. Unfortunately, your plan won't work. If we had not long ago learned how to prevent the formation of antibodies for our particular cells, our way of life would never have been possible."

The doctor frowned at this. "I should have thought of that. I suppose there's no use expecting your friend to let any of his own tissue be caught in a section or a blood sample, either." He looked up sharply. "How did you plan to make identification? You must have some method."