the stash-check that finds nothing
Entrepôt-bound, twitchy-eyed and checking both sides behind him as he comes, rounding the curve of Subdormitory B's hall with his stick and little solid frustum-shaped stool, Michael Pemulis sees at least eight panels of the drop-ceiling have somehow fallen out of their aluminum struts and are on the floor—some broken in that incomplete, hingey way stuff with fabric-content gets broken—including the relevant panel. No old sneaker is in evidence on the floor as he clears the panels to plant the stool, his incredibly potent Bentley-Phelps penlight in his teeth, looking up into the darkness of the struts' lattice.
Context
The whole ritual of the secret user's cache — the rehearsed furtiveness, the dedicated tools, the specialist penlight clenched in the teeth — enacted at the exact moment it fails: the panels down, the sneaker-stash gone, the Substance vanished by an agency the text never names. The addict's nightmare in one paragraph, the drug simply not there where it was hidden, and the emptied ceiling left as an open circuit under the book's endgame question of who took it and where it went.