rock the size of a walnut which would be found under the giant microscope in the laboratory; and told Alan to give it to the American Scientific Society to be guarded and watched very carefully.
This note was found, but Dr. Kent had vanished! There had been a midnight marauder. The laboratory was on the lower floor of the house. Through one of its open windows, so the police said, an intruder had entered. There was evidence of a struggle, but it must have been short, because neither Babs, Alan, the housekeeper, nor any of the neighbors had heard anything. And the fragment of golden quartz was gone!
The police investigation came to nothing. Polter was found in New York. He withstood the police questions. There was nothing except suspicion upon which he could be held, and he was finally released. Immediately thereafter, he disappeared.
Neither Alan, Babs nor I saw Polter again. Dr. Kent had never been heard from to this day, four years later when I flew to join the twins in Quebec. And now Alan told me that Polter was up there! We had never ceased to believe that Dr. Kent was alive, and that Polter was the midnight marauder. As we grew older, we began to search for Polter. It seemed to us, that if we could once get our hands on him, we could drag from him the truth which the police had failed to get.
The call of a traffic director in mid-Vermont brought me back from these memories. My buzzer was clanging; a peremptory halting signal day-beam came darting up at me from below. It caught me and clung. I shouted down at it.
"What's the matter?" I gave my name and number and all the details in one breath. Above everything I had no wish to be halted now. "What's the matter? I haven't done anything wrong."
"The hell you haven't," the director roared. "Come down to three thousand. That lane's barred."
I dove obediently and his beam followed me. "Once more, like that, young fellow--" But he went busy with somebody else and I didn't hear the end of his threat.
I crossed into Maine in mid-afternoon. It was already twilight. The sky was solid lead and the landscape all up through here was gray-white with snow in the gathering darkness. I passed the City of Jackman, crossing full over it to take no chances of annoying the border officials; and a few miles further, I dropped to the glaring lights of International Inspection Field. The formalities were soon finished. I was ready to take-off when Alan rushed at me.
"George! I thought I could connect here." He gripped me. He was wild-eyed, incoherent. He waved his taxiplane away. "I'm going with you, George. I'm almost out of my mind. I can't--I don't know what's happened to her. She's gone, now--"
"Who's gone? Babs?"
"Yes." He pushed me into my plane and climbed in after me. "Don't talk. Get us up! I'll tell you then. I shouldn't have left."
When we were up in the air, I swung on him. "What are you talking about? Babs gone?"
I could feel myself shuddering with a nameless horror.
"I don't know what I'm talking about, George. I'm about crazy. The Quebec police think I am, anyway. I've been raising hell with them for an hour. Babs is gone! I can't find her. I don't know where she is."
He finally calmed down enough to tell me what happened. Shortly after his radiophone to me in New York, he had missed Babs. They had had lunch in the huge hotel and then walked on the Dufferin Terrace--the famous promenade outside looking down over the Lower City, the great sweep of the St. Lawrence River and the gray-white distant Laurentian mountains.
"I was to meet her inside. I went in ahead of her. But she didn't come. I went back to the Terrace but she was gone. She wasn't in our rooms. Nor the library, the lobby--anywhere."
But it was afternoon, in the public place of a civilized city. In the daylight of the Dufferin Terrace, beside the long ice toboggan slide, under the gaze of skaters on the ice-rink and several hundred holiday merrymakers, a young girl could hardly be murdered, or kidnapped, without attracting attention! The Quebec police thought the young American unduly excited about his sister, who was missing only an hour. They would do what they could, if by dark she had not rejoined him. They suggested that doubtless the young lady had gone shopping.
"Maybe she did," I agreed. But in my heart, I felt differently. "She'll be waiting for us in the Hotel when we get there, Alan."
"But I'm telling you we saw Polter this morning. He lives here--not thirty miles from Quebec. We saw him on the Terrace after breakfast. Recognized him immediately of course."
"Did he
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