Occasion. for Disaster by Laurence M. Janifer

After Miss Dental Display had faded from Malone's screen, he just sat there, looking at the dead, gray front of the visiphone and feeling about twice as dead and at least three times as gray.

Things, he told himself, were terrible. But even that sentence, which was a good deal more cheerful than what he actually felt, did nothing whatever to improve his mood. All of the evidence, after all, had been practically living on the tip of his nose for God alone knew how long, and not only had he done nothing about it, he hadn't even seen it.