The blue cable had been tucked in alongside a vertical drainpipe that ran from the drain hole in the parapet down the front of the building. At some point the cable presumably peeled away from the drainpipe and entered the building through a window or some other opening, and that would mark the location of the Troll’s apartment. In a perfect world they would have been able to see that place from this vantage point and immediately pick out the apartment in question, but no such luck; it must be hidden beneath some horizontal feature that was blocking their view. And what with all the balconies, clotheslines, awnings, and external plumbing, there were plenty of those.