Prodigal Son

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        With the alacrity of a cat, Deucalion scaled the palisade, from floor to crest, in perhaps two seconds, three at most, crossed to the next aisle, looked down, leaped down. He had not been quick enough. Harker was gone.
        
        CARSON FOUND A SET of open spiral stairs in a corner. Rapid footsteps rang off metal risers high above. A creaking noise preceded a sudden loud rush of rain. A door slammed shut, closing out the immediate sound of the downpour.
        With one shot left and ready in the breach, she climbed.
        The steps led to a door. When she opened it, rain lashed her.
        Beyond lay the roof.
        She flipped a wall switch. Outside, above the door, a bulb brightened in a wire cage.
        After adjusting the latch so the door wouldn't automatically lock behind her, she went out into the storm.
        The broad roof was flat, but she could not see easily to every parapet. In addition to the gray screens of rain, vent stacks and several shedlike structures-perhaps housing the heating-cooling equipment and electrical panels-obstructed her view.
        The switch by the door had activated a few other lamps in wire cages, but the deluge drowned most of the light.
        Cautiously, she moved forward.
        
        SOAKED, CHILLED even though the rain was warm, certain that the phrase "like a drowned rat" would for the rest of his life bring him to tears, Michael moved among the vent stacks. Warily, he circled one of the sheds, making a wide arc at each corner.
        He had followed someone-something-onto the roof and knew that he was not alone here.
        Whatever their purpose might be, the cluster of small structures looked like cottages for roof Hobbits. After circling the first, he tried the door. Locked. The second was locked, too. And the third.
        As he moved toward the fourth structure, he heard what might have been the rasp of hinges on the door he had just tried-and then from a distance Carson shouting his name, a warning.
        
        IN EACH BLAZE of lightning, the shatters of rain glittered like torrents of beveled crystals in a colossal chandelier, but instead of brightening the roof, these pyrotechnics added to the murk and confusion.
        Rounding a collection of bundled vent pipes, Carson glimpsed a figure in this darkling crystal glimmer. She saw him more clearly when the lightning passed, realized that he was Michael, twenty feet away, and then she spotted another figure come out of one of the sheds. "Michael! Behind you!"
        Even as Michael turned, Harker-it had to be Harker-seized him and with inhuman strength lifted him off his feet, held him overhead, and rushed with him toward the parapet.
        Carson dropped to one knee, aimed low to spare Michael, and fired the shotgun.
        Hit in the knees, staggered, Harker hurled Michael toward the edge of the building.
        Michael slammed into the low parapet, started to slide over, nearly fell, but hung on and regained the roof.
        Although Harker should have been down, shrieking in agony, his knees no more supportive than gelatin, he remained on his feet. He came for Carson.
        Rising from a position of genuflection, Carson realized she had fired the last round. She held on to the weapon for its psychological effect, if any, and backed away as Harker approached.
        In the light of the rain-veiled roof lamps, in a quantum series of lightning flashes of escalating brightness, Harker appeared to be carrying a child against his chest, though his arms were free.
        When the pale thing clinging to Harker turned its head to look at her, Carson saw that it was not a child. Dwarfish, but with none of a dwarf's fairytale appeal, deformed to the point of malignancy, slit-mouthed and wicked-eyed, this was surely a phantasm, a trick of light and lightning, of rain and gloom, mind and murk conspiring to deceive.
        Yet the monstrosity did not vanish when she tried to blink it away. And as Harker drew nearer, even as Carson backed away from him, she thought the detective's face looked strangely blank, his eyes glazed, and she had the unnerving feeling that the thing clinging to him was in control of him.
        When Carson backed into a stack of vent pipes, her feet skidded on the wet roof. She almost fell.
        Harker surged toward her, like a lion bounding toward faltering prey. The shriek of triumph seemed to come not from