He'd reluctantly accepted the de la Farte theory, after rereading it to be certain he had not misread it before and was all but disheartened by the realization that it might take months or even years before he stumbled upon the name of a demon who might still be summoned-if, indeed there were any such.
"A Personal Demon" by David Bischoff, Rich Brown and Linda Richardson.
If you've heard of it, and read it, I'd be pretty impressed. It's like a 30 year old paperback. Loaned it out a few years ago, never came back and i had to hunt down a used copy of it through amazon, it's just gathering dust on my desk at the moment but i intend to read it again when i have a chance.