There was a good deal of evolutionary talk in the letters, and he'd assumed the term to be a part of that. Now he understood his error. The Shoal was a cult, or a church of some kind, and its symbol was the object he held in the palm of his hand. What it and the Art had to do with each other was by no means clear, but his long-held suspicion that this was one mystery, one journey, was here confirmed, and he knew that with the medallion as a map he'd find his way from Shoal to Art eventually.

In the meantime there was a more urgent concern. When he thought back to the tribe of co-workers, with Homer at its head, he shuddered to think that any of them might ever share the secret he'd uncovered. Not that they had any chance of making any real progress decoding it: they were too witless. But Homer was suspicious enough to at least sniff along the trail a little way, and the idea of anybody—but especially the boorish Homer—tainting this sacred ground was unbearable. There was only one way to prevent such a disaster. He had to act quickly to destroy any evidence that might put Homer on the right track. The medallion he'd keep, of course: he'd been entrusted with it by higher powers, those faces he'd one day get to see. He'd also keep the twenty of thirty letters that had proffered the best information on the Shoal; the rest (three hundred or so) had to be burned. As to the collection in the Dead Letter Room, they had to go into the furnace too. All of them. It would take time, but it had to be done, and the sooner the better. He made a selection of the letters in his room, parcelled up those he didn't need to keep, and headed off back to the Sorting Office.

It was late afternoon now, and he travelled against the flow of human traffic, entering the Office by the back door to avoid Homer, though he knew the man's routine well enough to suspect he'd punched out at five-thirty to the second, and was already guzzling beer somewhere.