Freibur has no moon, but it was a clear night and the stars cast enough light to see by. The roof guard saluted when I went by, and I could see the red spark of a cigarette in his hand. I should have said something about it, but my mind was too occupied. Passing on I turned a corner and stood leaning on the parapet, looking out unseeingly at the black bulk of the mountains. Something kept gnawing for attention and after a few minutes I recognized what it was. The guard. He was there for a purpose, and smoking on duty wasn't considered the best behavior for a sentry. Perhaps I was being finicky, but it is a failing of mine. Take care of all the small factors and the big ones take care of themselves. In any case, simply thinking about it was bothering me, so I might as well go around and say a word to him. He wasn't at his usual post, which was optimistic; at least he was making the rounds and keeping an eye on things. I started to walk back when I noticed the broken flowers hanging from the edge of the garden. This was most unusual because the roofgardens were the Count's special pleasure and were practically manicured daily. Then I saw the dark patch in among the flowers and had the first intimation that something was very, very wrong. It was the guard, and he was either dead or deeply unconscious. I didn't bother to find out which. There was only one reason I could think of for someone to be here at night like this. Angelina. Her room was on the top floor, almost below this spot. Silently I ran to the decorative railing and looked over. Five meters below was the white patch of the balcony outside her window. Something black and formless was crouched there. My gun was in my room. For one of the few times in my life I had been so disturbed that my normal precautions were forgotten. My concern over Angelina was going to cost her her life. All of this I realized in a fraction of a second as my fingers ran along the balustrade. A shiny blob was fixed there, anchoring a strand so thin that it was invisible, yet I knew was as strong as a cable. The assassin had lowered himself with a web-spinner, a tiny device that spun a thin strand like a spider. Only the strand's substance was formed of a single long-chain molecule that could support a man's weight. It would slice my hands like the sharpest blade if I tried to slide down it. There was only one way I could reach that balcony, a tiny square above the two kilometer drop into the valley below. I made the decision even as I was leaping up onto the rail. It had a wide flat top and I sat for an instant to catch my balance. Below me the window swung open noiselessly and I dropped, my heels extended, aiming for the man below.