The people passing here were another source of uncertainty. As Dan approached the center of the city, he began to sense the peculiar air of freedom that he had noticed in resort towns on a dozen planets. And yet this did not look to him like a resort town. Moreover, it was hard to gauge the mood of the people passing by, because nearly all seemed to react to his presence in some way. Some looked suddenly alarmed, a few looked furtive, others seemed pleased and smiled at him. A considerable number of the women had a thrilled look when they saw him. Dan walked another block and saw part of the reason for the resort-town atmosphere. Across the street was a sweeping expanse of green. In the far end of this green was an enormous swimming pool, with floats and concrete islands dotted through it to hold diving boards that were almost constantly in use. Dan, wanting to watch the passersby without their watching him, stepped into a quiet, old-fashioned-looking bookstore that fronted on the green. He looked out the many-paned front window and immediately noticed a change in the people. Without his inexplicably disturbing influence, nearly all of the people fell into two distinct categories. One group had a depressed and angry look. The other group looked cheerful and carefree. Aside from their mood, they didn't seem to differ noticeably in dress, age, or any other way. Dan glanced around the bookstore and saw that it, like the other stores, could be transplanted to Earth, and--except for the unfamiliar lettering on storefront and book titles--would hardly be noticed. He nodded to an elderly woman working at a small desk to one side of the store, then walked to the rear, where the stacks of books left a far corner partially in shadow and out of sight from the front of the store. Dan stooped, glanced at the dusty row of books on the bottom shelf, and slid a mataform transceiver behind the books. He walked back to the front of the store, stepped out on the sidewalk, and saw a cart come slowly along in the street. This was the kind of cart he had seen earlier. The outstretched figures of men lay bumping loosely on the cart, metal cords with oblong tags tight around their necks. Dan stepped over to note that the tags he could see all read: --KILL-- UNAUTHORIZED * * * * * There was a buzz of indignation from the crowd on the sidewalk as the cart went by. Then there was a sudden silence. Dan glanced around. Walking along the sidewalk toward him was a man about his own height and build, who moved with controlled catlike steps. The man looked directly at Dan and called out: "Hello, Death!" The people on the sidewalk rushed to get out of the way. Abruptly the man's arm swung back and forward. "Catch." Something flashed in the air.