she rolled over onto her back with a waking moan and surveyed the squalid confines of the dreg den ; kitchenette and lavatory within feet of the depressed mattress on the floor , the old , broken 2-d screen at the back , old paperback books on a solitary countertop and foul smells she could scarcely identify and the scuttle of vermin and the buzz of insects through the stagnant vents .