Supermind by Laurence M. Janifer

After the great mass of teeth, vaguely surrounded by a face, had faded from Malone's screen, he just sat there, looking at the dead, grey screen of the visiphone and feeling about twice as dead and at least three times as grey.

Things, he told himself, were terrible. But even that sentence, which was a good deal more cheerful than what he actually felt, didn't do anything to improve his mood. All of the evidence, after all, had been practically living on the tip of his nose for nearly twenty-four hours, and not only had he done nothing about it, but he hadn't even seen it.