But where Fess went, Dad would go--after all, he was riding the robot-horse.

Rod rode uphill through the gathering gloom. He could no longer see the squat tower, but he knew it was there. Weariness tugged at every fiber, but he fought it off and kept riding. "He could be anywhere around here-if he's here at all. Any sign of him, Fess?"

"There is a trail off to our right, Rod."

"You mean the footpath? The one that virtually screams, `Look here to discover intruders'? That footpath?"

"The very same, Rod. The one you decided to avoid."

"I noticed you didn't disagree. Why? You see some sign of Magnus there?"

"Unfortunately not-but we might, if we went closer."

"No need-we're coming out on top of the ridge, now." Rod tensed. "Odds are the trail leads there, too-to the tower." He loosened his sword in its sheath.

Fess stopped, looking downward. "What's the holdup?" Rod frowned. "There is a skeleton, Rod."

Rod froze, then looked down.

Sure enough, it was a skeleton, wrapped around the base of the tree as though it had died out of devotion to the forest. Rod felt his scalp prickling. "Odd posture, wouldn't you say?"

"I would, Rod. It is indicative of ritual slaying."

"Or someone with a bizarre sense of humor." Rod was far less charitable than his robot. "A someone with a very twisted mind-and a cavity where his heart should be."

"There are others," Fess reported, surveying the hillside with infrared eyes. "A dozen at least, that I can see from this location."

"The townsfolk did say something about the witch taking young men, didn't they?" Rod scowled. "And something about very few of them ever coming back."

"Surely you are not saying that this is what she did to them when she became bored with them!"

"I've heard of worse-I suppose. Come on, Rust Rider. Let's see what we can find around the other trees."

"Rod, I resent. . . "

"Okay, okay! You're a Stainless Steel Steed. Up and out of the trees now, okay?"

Moving slowly, Fess stepped out of the scrub and into the shadow of the last tree, a huge old oak with the scars of broken limbs, rough bark, and ...

Something pale at the base.

Rod stared down, transfixed, not even able to speak.

A snake lay coiled around the roots-a pale snake with his son's head. Magnus opened his mouth-and hissed.

Fury struck, anger at the witch who had mangled his son. The world about him dimmed as Rod concentrated on the spell, the compulsion imposed on his son, which had twisted his perceptions into seeing himself as a snake, and made him project his own delusion into other people's minds-with all the titanic strength of the hybrid esper he was.

Rod tore at that compulsion, pushing it away with all the strength of his mind; for a moment, he saw Magnus as he really was, naked and curled around the base of the oak. But only for a moment; then the young man's mind forced the delusion back into Rod's, and he realized just how much more powerful his son's mind was than his own. Rod withdrew shaken and reeling. Awe and dread pooled within him, but he let them pass, holding on to Fess's mane and waiting for the dizziness to subside, for pride to rise in its stead-and found that the anger was still there, glowing hot, but controlled now, energy to be directed, not tearing loose. He looked down into his son's shrunken face. "Who did it, Magnus? Tell me her name. Just think it. Show me her face-and where she is."

The snake's face creased with desperation; the mouth opened, but all that came out was a strained hiss. Magnus's mind, though, flashed through the answers to Rod's questions-the name "Hag of the Tower," the song drifting through the dusk, the dream-girl, the long, long tug of wills between seduction and truth....

"Got it." Rod nodded. "In the tower." He turned to look up at the stone pile, the image of the foul old witch still vivid in his mind, and sent out a telepathic summons, immediate and commanding, brooking no delay. He felt Magnus's mind writhe in a panic of shame and embarrassment at the thought of the help he was calling in, but Rod quelled it with a stern admonition, a pure-thought equivalent of "This is no time for vanity." Of course, it was scarcely "vanity" when the "help" would see you coiled around a tree trunk-but there wasn't much option, either. Aloud, he said, "You stay there for a few minutes," and turned Fess's head away toward the tower. Behind him, Magnus gave a last hiss, as much of exasperation as of despair-but Rod felt the young man's mind melding with his own, subordinating its strength to his direction. Rod smiled tightly, solace and warmth almost making him forget his anger for a moment.

Then he came to the portal.

The door to the Hag's tower was ten feet high, of stout old hardwood planks, weathered past gray into darkness, and polished at head-height by use. Something glinted in the moonlight; Rod looked up. He saw a scythe blade with its tip broken off. It hung from a rusty chain, and attached to that chain were old horseshoes, broken bolts, cracked pots-a complete collection of junk metal-framing the portal. Above it hung another chain, stretching off around the tower with more junk attached.

Lousy housekeeping-but all Cold Iron. That explained why the Little People hadn't done anything about the witch. Rod was glad the door wasn't anything that looked to be worth saving. He narrowed his eyes, directing Magnus's ferocious raw emotional power at it....

With a blast like that of a cannon, the door flew apart, splinters flying in all directions. An unseen field deflected them as Fess leaped ahead, carrying Rod into the darkness of the witch's lair.

It was infested.

All around the curve of the walls stood great earthenware urns, unglazed terra cotta, sealed across their mouths-but as Rod rode in, those seals broke, the jars cracked; a foul ichor began to ooze out, and strange bloated beings struggled through the openings. They leaped down, fully formed and instantly alert, and came at him from all sides, hairless rats the size of Doberman Pinschers, glowing yellow-green teeth dripping ichor, running on two feet, front paws stretching out to claw.

Rod was in no mood for subtlety. He pointed both forefingers, thinking of machine guns and laser cannon, and streaks of ruby light sliced through the rats. Supersonic screams tore at his head as the rats split in half, twitching, tops and bottoms both still struggling toward him, then in half again as the ruby beams came back, and back once more, till they were struggling, heaving blobs of protoplasm. Then, suddenly, they subsided into mounds of gray fungus. Rod nodded; it had been an open question, whether they had been constructs, or just illusions. In either case, light had dispelled them.

He turned to the spiral staircase. "Think you can manage them, Fess?"

"This body has its limits, Rod, but that helix does not surpass them." The horse started up the steps.

As he passed the first turn, a huge hissing filled the stairwell. Rod scowled, eyes trying to pierce the darkness. "What's coming, Fess?"

"I hear a rapid scraping, Rod, but I do not see . . ."

Two yellow eyes glowed in the darkness above them, small but wide apart, and the hiss filled the whole stairway, beating at Rod's ears. Enough, he decided, and thought of molecules racing faster and faster, closer and closer together...

A spark glowed in midair, growing and growing, shedding a dim light on the scene....

Enough for Rod to see a monster snake, gliding down the stair toward him. Its body was at least three feet thick; its mouth opened a foot wide, and that was just enough to let out the hiss. The pits beneath its eyes were minor caves-but it seemed to have been waked in mid-molt. Shreds of skin hung from it, some showing muscle and blood underneath; a rotting crest waved atop its head; wattles hung down from its jaws. There wasn't enough light to tell colors, really, but it seemed to be the grayish-blue of a dead fish's belly.