Skagg took one step forward.

Frank took one step backward.

"Your kind have only one use—you're interesting prey."

Frank said, "Well, I'm glad to hear we're interesting."

Skagg took another step forward, and a mantis shadow rippled across his face.

Frank stepped backward.

"Your kind are born to die."

Always interested in the workings of a criminally insane mind, just as a surgeon is always interested in the nature of the cancers that he excises from his patients' bodies, Frank said, "My kind, huh? What kind is that exactly?"

"Humankind."

"Ah."

"Humankind," Skagg repeated, speaking the word as if it were the vilest epithet.

"You're not human? Is that it?"

"That's it," Skagg agreed.

"What are you then?"

Skagg's insane laughter was as affecting as hard arctic wind.

Feeling as if bits of ice had begun to form in his bloodstream, Frank shivered. "All right, enough of this. Drop to your knees, then flat on your face."

"You're so slow-witted," Skagg said.

"Now you're boring me. Lie down and spread your arms and legs, you son of a bitch."

Skagg reached out with his right hand in such a way that for one disconcerting moment it seemed to Frank that the killer was going to change tactics and begin pleading for his life.

Then the hand began to change. The palm grew longer, broader. The fingers lengthened by two inches. The knuckles became thicker, gnarled. The hand darkened until it was singularly unhealthy, mottled brown-black-yellow. Coarse hairs sprouted from the skin. The fingernails extended into wickedly sharp claws.

"So tough you were. Imitation Clint Eastwood. But you're afraid now, aren't you, little man? Afraid at last, aren't you?"

Only the hand changed. No alterations occurred in Skagg's face or body or even in his other hand. He obviously had complete control of his metamorphosis.

"Werewolf," Frank said in astonishment.

With another peal of lunatic laughter that rebounded tinnily from the warehouse walls, Skagg worked his new hand, curling and extending and recurling his monstrous fingers.

"No. Not a werewolf," he whispered fiercely. "Something far more adaptable. Something infinitely stranger and more interesting. Are you afraid now? Have you wet your pants yet, you chickenshit cop?"

Skagg's hand began to change again. Coarse hairs receded into the flesh that had sprouted them. The mottled skin grew darker still, the many colors blending into green-black, and scales appeared. The fingertips thickened and grew broader, and suction pads formed on them. Webs spun into existence between fingers. The claws subtly changed shape, but they were no shorter or less sharp than the lupine claws had been.

Skagg peered at Frank through those hideous spread fingers and over the half-moon curves of the opaque webs. Then he lowered his hand slightly and grinned. His mouth had also changed. His lips were thin, black, and pebbled. He revealed pointed teeth and two hooked fangs. A thin, glistening, fork-tipped tongue flickered across those teeth, licked the pebbled lips.

At the sight of Frank's horrified astonishment, Skagg laughed. His mouth once more assumed the appearance of a human mouth.

But the hand underwent yet another metamorphosis. The scales were transformed into a hard-looking, smooth, purple-black, chitinous substance, and the fingers, as if wax brought before a flame, melted together until Skagg's wrist terminated in a serrated, razor-sharp pincer.

"You see? No need of a knife for this Night Slasher," whispered Skagg. "Within my hands are an infinite variety of blades."

Frank kept his .38 revolver pointed at his adversary, though by now he knew that even a .357 Magnum loaded with magnum cartridges with Teflon tips would provide him with no protection.

Outside, the sky was split by an ax of lightning. The flash of the electric blade sliced through the narrow windows high above the warehouse floor. A flurry of rafter shadows fell upon Frank and Skagg.

As thunder crashed across the night, Frank said, "What the hell are you?"

Skagg did not answer right away. He stared at Frank for a long moment and seemed perplexed. When he spoke, his voice had a double-honed edge: curiosity and anger. "Your species is soft. Your kind has no nerve, no guts. Faced with the unknown, your kind react as sheep react to the scent of a wolf. I despise your weakling breed. The strongest men break after what I've revealed. They scream like children, flee in panic, or stand paralyzed and speechless with fear. But not you. What makes you different? What makes you so brave? Are you simply thickheaded? Don't you realize you're a dead man? Are you foolish enough to think you'll get out of this place alive? Look at you—your gun hand isn't even trembling."

"I've had more frightening experiences than this," Frank said tightly. "I've been through two tax audits."

Skagg did not laugh. He clearly needed a terrified reaction from an intended victim. Murder was not sufficiently satisfying; evidently he also required the complete humiliation and abasement of his prey.

Well, you bastard, you're not going to get what you need from me, Frank thought.

He repeated, "What the hell are you?"

Clacking the halves of his deadly pincers, slowly taking a step forward, Karl Skagg said, "Maybe I'm the spawn of Hell. Do you think that could be the explanation? Hmmmm?"

"Stay back," Frank warned.

Skagg took another step toward him. "Am I a demon perhaps, risen from some sulfurous pit? Do you feel a certain coldness in your soul; do you sense the nearness of something satanic?"

Frank bumped against one of the forklifts, stepped around the obstruction, and continued to retreat.

Advancing, Skagg said, "Or am I something from another world, a creature alien to this one, conceived under a different moon, born under another sun?"

As he spoke, his right eye receded into his skull, dwindled, vanished. The socket closed up as the surface of a pond would close around the hole made by a pebble; only smooth skin lay where the eye had been.

"Alien? Is that something of which you could conceive?" Skagg pressed. "Have you sufficient wit to accept that I came to this world across an immense sea of space, carried on galactic tides?"

Frank no longer wondered how Skagg had battered open the door of the warehouse; he would have made hornlike hammers of his hands—or ironlike pry bars. No doubt he had also slipped incredibly thin extensions of his fingertips into the alarm switch, deactivating it.

The skin of Skagg's left cheek dimpled, and a hole formed in it. The lost right eye flowered into existence within the hole, directly under his left eye. In two winks both eyes re-formed: They were no longer human but insectoid, bulging and multifaceted.

As if changes were taking place in his throat too, Skagg's voice lowered and became gravelly. "Demon, alien ... or maybe I'm the result of some genetic experiment gone terribly wrong. Hmmmm? What do you think?"

That laugh again. Frank hated that laugh.

"What do you think?" Skagg insisted as he approached.

Retreating, Frank said, "You're probably none of those things. Like you said ... you're stranger and more interesting than that."

Both of Skagg's hands had become pincers now. The metamorphosis continued up his muscular arms as his human form gave way to a more crustacean anatomy. The seams of his shirt sleeves split; then the shoulder seams also tore as the transformation continued into his upper body. Chitinous accretions altered the size and shape of his chest, and his shirt buttons popped loose.

Though Frank knew he was wasting ammunition, he fired three shots as rapidly as he could squeeze the trigger. One round took Skagg in the stomach, one in the chest, one in the throat. Flesh tore, bones cracked, blood flew. The shapechanger staggered backward but did not go down.

Frank saw the bullet holes and knew that a man would die instantly of those wounds. Skagg merely swayed. Even as he regained his balance, his flesh began to knit up again. In half a minute the wounds had vanished.

With a wet cracking noise, Skagg's skull swelled to twice its previous size, though the change had nothing to do with the revolver fire that the shapechanger had absorbed. His face seemed to implode, all the features collapsing inward, but almost at once a mass of tissue bulged outward and began to form queer insectoid features.

Frank did not wait to see the grotesque details of Skagg's new countenance. He fired two more rounds at the alarmingly plastic face, then ran, leaped over an electric cart, dodged around a big forklift, sprinted into an aisle between tall metal shelves, and tried not to feel pain in his side as he ran back through the long warehouse.

When that morning had begun, dreary and rain-swept, with traffic moving through the city's puddled streets at a crawl, with the palm trees dripping, with the buildings somber in the gray storm light, Frank had thought that the spirit of the day was going to be as soggy and grim as the weather—uneventful, boring, perhaps even depressing. Surprise. Instead the day had turned out to be exciting, interesting, even exhilarating. He just never knew what fate had in store for him next, which was what made life fun and worth living.

Frank's friends said that in spite of his hard shell, he had an appetite for life and fun. But that was only part of what they said about him.

Skagg let out a bleat of rage that sounded utterly inhuman. In whatever shape he had settled upon, he was coming after Frank, and he was coming fast.

5

FRANK CLIMBED SWIFTLY AND UNHESITATINGLY IN SPITE OF THE PAIN IN his ribs. He heaved himself onto the top of another three-story-high wall of crates—machine tools, transmission gears, ball bearings—and rose to his feet.

Six other crates, which were not part of the wall itself, were stacked at random points along the otherwise flat top of those wooden palisades. He pushed one box to the edge. According to the printing on the side, it was filled with twenty-four portable compact-disc players, the kind that was carried by antisocial young men who used the volume of their favorite unlistenable music as a weapon with which to assault innocent passersby on the street. He had no idea what the damn things were doing among the stacks of machine tools and bearings; but the box weighed only about two hundred pounds, and he was able to slide it.

In the aisle below, something issued a shrill, piercing cry that was part rage, part challenge.

Frank leaned out past the box that he had brought to the brink, squinted down, and saw that Karl Skagg had now assumed a repulsive insectoid form that was not quite that of a two-hundred-fifty-pound cockroach and not quite a praying mantis but something between.

Suddenly the thing's chitin-capped head swiveled. Its antennae quivered. Multifaceted, luminous amber eyes gazed up at Frank.

He shoved the box over the edge. Unbalanced, he nearly plummeted with it. Wrenching himself back from the brink, he tottered and fell on his butt.

The carton of portable compact-disc players met the floor with thunderous impact. Twenty-four arrogant punks with bad taste in music but with a strong desire for high-tech fidelity would be disappointed this Christmas.

Frank crawled quickly to the edge on his hands and knees, looked down, and saw Skagg's squirming insectoid form struggling free of the burst carton that had briefly pinned him to the floor. Getting to his feet, Frank began to shift his weight rapidly back and forth, rocking the heavy crate under him. Soon half the wall was rocking too, and the column of boxes beneath Frank swayed dangerously. He put more effort into his frantic dance of destruction, then jumped off the toppling column just as it began to tilt out of the wall. He landed on an adjacent crate that was also wobbling but more stable, and he fell to his hands and knees; several formidable splinters gouged deep into his palms, but at the same time he heard at least half a dozen heavy crates crashing into the aisle behind him, so his cry was one of triumph rather than pain.

He turned and, flat on his belly this time, eased to the brink.

On the floor below, Skagg could not be seen beneath the ton of debris. However, the shapechanger was not dead; his inhuman screams of rage attested to his survival. The wreckage was moving as Skagg pushed and clawed his way out of it.

Satisfied that he had at least gained more time, Frank got up, ran the length of the wall of boxes, and descended at the end. He hurried into another part of the warehouse.

Along his randomly chosen route, he passed the half-broken door by which he and Skagg had entered the building. Skagg had closed it and stacked several apparently heavy crates against it to prevent Frank from making an easy, silent exit. No doubt the shapechanger also had damaged the controls for the electric garage doors at the front of the warehouse and had taken measures to block other exits.

You needn't have bothered, Frank thought.

He was not going to cut and run. As a police officer, he was duty-bound to deal with Karl Skagg, for Skagg was an extreme threat to the peace and safety of the community. Frank believed strongly in duty and responsibility. And he was an ex-marine. And ... well, though he would never have admitted as much, he enjoyed being called Hardshell, and he took pleasure in the reputation that went with the nickname; he would never fail to live up to that reputation.

Besides, though he was beginning to tire of the game, he was still having fun.

6

IRON STEPS ALONG THE SOUTH WALL LED UP TO A HIGH BALCONY WITH A metal-grid floor. Off the balcony were four offices in which the warehouse's managerial, secretarial, and clerical staffs worked.

Large, sliding glass doors connected each office with the balcony, and through the doors Frank could see the darkish forms of desks, chairs, and business equipment. No lamps were on in any of the rooms, but each had outside windows that admitted the yellow glow of nearby streetlamps and the occasional flash of lightning.

The sound of rain was loud, for the curved ceiling was only ten feet above. When thunder rolled through the night, it reverberated in that corrugated metal.

At the midpoint of the balcony, Frank stood at the iron railing and looked across the immense storage room below. He could see into some aisles but by no means into all or even a majority. He saw the shadowy ranks of forklifts and electric carts among which he had encountered Skagg and where he had first discovered his adversary's tremendous recuperative powers and talent for changing shape. He also could see part of the collapsed wall of crates where he had buried Skagg under machine tools, transmission gears, and CD players.

Nothing moved.

He drew his revolver and reloaded. Even if he fired six rounds pointblank into Skagg's chest, he would succeed only in delaying the shapechanger's attack for a minute or less while the bastard healed. A minute. Just about long enough to reload. He had more cartridges, although not an endless supply. The gun was useless, but he intended to play the game as long as possible, and the gun was definitely part of the game.