I've lost it. I've looked high and low, on bookshelves, behind shelves, under shelves. I've looked in all the likely places, all the probable places and all the possible places. The only places left are the highly improbable, and I've looked in some of those already, too.
Oh bother. I think I'm going to have to pay for it, and I just know it'll show up in a year or two because it must be here somewhere!
Who's the saint for missing library books?