"How bad was it?" asked Mary.

"Pretty bad. I don't know how many we killed, maybe six, maybe a dozen. There was no time to be careful. We weren't shooting people, not intentionally; we were shooting parasites." I turned to Davidson. "Don't you see that?"

He seemed to take a brace. "That's just it. They weren't human." He went on, "I think I could shoot my own brother, if the job required it. But these things aren't human. You shoot and they keep coming toward you. They don't-" He broke off.

All I felt was pity. After a bit he got up to go to the dispensary to get a shot for what ailed him. Mary and I talked a while longer, trying to figure out answers and getting nowhere. Then she announced that she was sleepy and headed for the women's dormitory. The Old Man had ordered all hands to sleep in that night, so, after a nightcap, I went to the boys' wing and crawled in a sack.

I did not get to sleep at once. I could hear the rumble of the city above us and I kept imagining it in the state Des Moines was already in.

The air-raid alarm woke me. I stumbled into my clothes as the blowers sighed off, then the intercom bawled in the Old Man's voice, "Anti-gas and anti-radiation procedures! Seal everything-all hands gather in the conference hall. Move!"

Being a field agent I was a supernumerary with no local duties. I shuffled down the tunnel from the living quarters to the Offices. The Old Man was in the big hall, looking grim. I wanted to ask him what was up, but there was a mixed dozen of clerks, agents, stenos, and such there before me and I decided not to. After a bit the Old Man sent me out to get the door tally from the guard on watch. The Old Man called the roll himself and presently it was clear that every living person listed on the door tally was now inside the hall, from old Miss Haines, the Old Man's private secretary, down to the steward of the staff lounge-except the door guard on watch and Jarvis. The tally had to be right; we keep track of who goes in and out a good bit more carefully than a bank keeps track of money.

I was sent out again for the door guard. It took a call back to the Old Man to persuade him it was all right for him to leave his post; he then threw the bolt switch and followed me. When we got back Jarvis was there, being attended by Graves and one of his lab men. He was on his feet and wrapped in a hospital robe, conscious apparently, but he seemed dopey.

When I saw him I began to have some notion of what it was all about. The Old Man did not leave us in doubt. He was facing the assembled staff and keeping his distance; now he drew his gun. "One of the invading parasites is loose among us," he said. "To some of you that means something-too much. To the rest of you I will have to explain, as the safety of all of us-and of our whole race-depends this moment on complete cooperation and utter obedience." He went on to explain briefly but with ugly exactness what a parasite was, what the situation was. "In other words," he concluded, "the parasite is almost certainly here in this room. One of us looks human but is actually an automaton, moving at the will of our deadliest and most dangerous enemy."

There was a murmur from the staff. People stole glances at each other. Some tried to draw away. A moment before we had been a team, picked for temperament compatibility; we were now a mob, each suspicious of the other. I felt it myself and found myself edging away from the man closest to me-Ronald the lounge steward, it was; I had known him for years.

Graves cleared his throat. "Chief," he started in, "I want you to understand that I took every reasonable-"

"Stow it. I don't want excuses. Bring Jarvis out in front. Take his robe off."

Graves shut up and he and his assistant complied. Jarvis did not seem to mind; he seemed only partly aware of his surroundings. There was a nasty blue welt across his left cheekbone and temple, but that was not the cause; I did not hit him that hard. Graves must have drugged him.

"Turn him around," the Old Man ordered. Jarvis let himself be turned; there was the mark of the slug, a red rash on the shoulders and neck. "You can all see," the Old Man went on, "where the thing rode him." There had been some whispers and one embarrassed giggle when Jarvis had been stripped; now there was a dead hush.

"Now," said the Old Man, "we are going to get that slug! Furthermore, we are going to capture it alive. That warning is for you eager boys with itchy trigger fingers. You have all seen where a parasite rides on a man. I'm warning you; if the parasite gets burned, I'll burn the man who did it. If you have to shoot the host to catch it, shoot low. Come here!" He pointed his gun at me.

I started toward him; he halted me halfway between the crowd and himself. "Graves! Take Jarvis out of the way. Sit him down behind me. No, leave his robe off," Jarvis was led across the room, still docile, and Graves and his helper rejoined the group. The Old Man turned his attention back to me. "Take out your gun. Drop it on the floor."

The Old Man's gun was pointed at my belly button; I was very careful how I drew mine. I slid it some six feet away from me. "Take off your clothes-all of them."

I am no shrinking violet, but that is an awkward order to carry out. The Old Man's gun overcame my inhibitions.

It did not help any to have some of the younger girls giggling at me as I got down to the buff. One of them said, not too sotto voce, "Not bad!" and another replied, "Knobby, I'd say."

I blushed like a bride.

After he looked me over the Old Man told me to pick up my gun and stand beside him. "Back me up," he ordered, "and keep an eye on the door. You! Dotty Something-or-other-you're next."

Dotty was a girl from the clerical pool. She had no gun, of course, and she had evidently been in bed when the alarm sounded; she was dressed in a floor length negligee. She stepped forward, stopped, but did nothing more.

The Old Man waved his gun at her. "Come on-get 'em off! Don't take all night."

"You really mean it?" she said incredulously. "Move!"

She started-almost jumped. "Well!" she said, "no need to take a person's head off." She bit her lower lip and then slowly unfastened the clasp at her waist. "I ought to get a bonus for this," she said defiantly, then threw the robe from her all in one motion.

Whereupon she ruined her buildup by posing for an instant-not long, but you couldn't miss it. I concede that she had something to display, although I was in no mood to appreciate it.

"Over against the wall," the Old Man said savagely. "Renfrew!"

I don't know whether the Old Man alternated men and women on purpose or not, but it was a good idea, as it kept resistance to a minimum. Oh, shucks, I do know-the Old Man never did anything by accident. After my ordeal the men were businesslike though some were obviously embarrassed. As to the women, some giggled and some blushed, but none of them objected too much. I would have found it interesting if the circumstances had been different. As it was, we were all bound to learn things about each other that we had not known. For instance there was a girl whom we used to call "Chesty"-never mind. In twenty minutes or so there were more square yards of gooseflesh exposed than I had ever seen before and the pile of guns on the floor looked like an arsenal.

When Mary's turn came, she set a good example by taking off her clothes quickly and in a completely unprovocative manner-the Old Man should have called her first, instead of that Dotty baggage. Bare, Mary made nothing of it, and wore her skin with quiet dignity. But what I saw did nothing to cool down my feelings about her.

Mary had added considerably to the pile of hardware. I decided she just plain liked guns. Me, I've never found use for more than one.