Through the forest went the unicorn, so smoothly that she seemed to glide. Dabs of sunlight lay here and there about, making the green of the leaves seem darker, but filling the woods with brightness. Cordelia rode blithely through the cool shade, singing with joy, happily ignoring her brothers, who flitted through the trees to either side, calling for her to stop.

Puck had vanished.

Then Cordelia rode out of the trees and into a village.

It was very small, perhaps a dozen houses, set against the foot of a rocky slope, with open meadow between itself and the forest. Cordelia called out happily, expecting people to look up in amazement when they saw her astride her unicorn.

Only silence answered.

Cordelia lost her smile. She stared ahead, realizing that she could see no one in the village, not a soul.

Gregory swooped toward her. The unicorn shied, and he swerved away, calling, "Cordelia, none live in that village— and there hath been fire! Turn back!"

"I cannot," Cordelia answered. " 'Tis the unicorn who doth go where she wist, not I who guide her." Though, truth to tell, she suspected that her mount would have turned aside, if Cordelia had asked it of her.

Now that they were closer, she could see the remains of the fire Gregory had spoken of. The walls of the cottages were scorched, their thatched roofs burned away, leaving only charred timbers. A huge black blemish hid the village common; what was left of its green field was brown and brittle grass. Doors swung ajar; bowls and tools lay scattered where they had fallen.

The deserted village lay silent; the only sound was the sigh of the wind. A shutter clattered against a window, then sagged open again. In the forest behind them, birds sang—but none here.

Magnus hovered near a roof-beam, reaching out to touch it. He snatched his hand away with an oath. " 'Tis yet hot, and embers glow. This fire burned not long agone."

Geoffrey nodded, landing near the square, looking about him. "The doors may swing in the wind, but none have torn from their hinges—nor are the wooden bowls and tool-handles weathered."

"They have left with no plan aforetime." Gregory stared about him.

The unicorn halted, nose pointed toward the mountainside.

"'Tis here that she hath meant to come, I think." Cordelia's voice was low. "And she did intend to bring us here."

"'Tis reason enough to go, and quickly," Gregory whispered.

"Nay!" Magnus's heels jolted against the charred earth as he landed. "I would we had not come—but now that we have, we must discover what hath happed in this place. There may be folk in need of such aid as we can offer."

"Nay!" Puck popped up from a burned-out bush. "Thou must needs go back, and quickly! For the elves of this village have told me what hath happed this night past!"

"Then say!"

"What was't?"

"Tell, Robin!" The boys clustered around him.

"A dragon."

The boys only stared. Cordelia watched, wide-eyed, from the back of her unicorn.

Puck nodded. "A great, vile monster it was, fifty feet from nose to tail-tip, with fangs of steel and fiery breath!" He whirled, pointing to the mountainside. "Seest thou where it did crawl away?"

The children looked and, for the first time, noticed a broad trail of scorched earth that led away from the village and up the rocky slope, winding away out of sight around the curve of the hill.

"And it lurks up there still?" Geoffrey whispered.

Puck shrugged. "Who may say? Never have the Wee Folk seen the monster aforetime. Mayhap 'tis gone again."

"Or mayhap it doth lurk about the countryside," said Geoffrey, "awaiting the unwary passerby."

Huge feet pounded the dusty lane behind them, and a massive body clashed against a burned-out wall.

The children spun about, hearts hammering; the unicorn

whirled to face whatever came, and Puck leaped out in front of them all, arms poised to hurl his most dire spell.

An enormous black horse came around a cottage and out into the village square.

The children stared, frozen.

Then they whooped with relief and ran to leap onto the animal, throwing their arms around its neck and drumming their heels against its sides. "Fess!"

"How good art thou to come!"

"We should ha' known thou wouldst follow!"

Fess was their father's horse, and a very strange and wonderful horse he was. Papa said he was made of steel, and that the horsehair covering him was only put on with something like glue. Papa said he was a "robot," but the children weren't sure what that meant. They knew it was something magical, though, because Fess could do things that no ordinary horse could—and one of them was talking. Only to Papa, usually —but he could let Mama and the children hear him if he wanted to. Inside their minds.

"You should have known I would not let you wander without me, children," he scolded. "And you were very naughty to stray off by yourselves."

"But we are not alone," Gregory assured him. "Puck is here."

"And this!" Cordelia whirled away, suddenly remembering her unicorn. She threw her arms about the beast's neck, as though she were afraid it would get away. "I have a new friend, Fess!"

The big black horse stared at the unicorn for a moment. Then his knees began to tremble. "But… unicorns do not… exist…" Suddenly, his head dropped like a stone, and his legs locked stiff. His head swung gently between his fetlocks.

"We should have warned him," Gregory said.

"We should indeed." Magnus heaved a sigh. "Ever doth he have such a seizure, when he doth encounter something that he thinks cannot be real."

Puck nodded. "So he did when first he did espy an elf. Yet I should think he would have become accustomed to the sight of strange new beings."

"Papa said 'tis one of the nicest things about Fess," Cordelia explained, "that he never doth grow used to strange new sights."

Magnus groped beneath Fess's saddle horn for the big lump

in his backbone. He found it and pressed hard. Something clicked, and Fess slowly raised his head. "I… had a… seizure… did I not?"

"Thou didst," Magnus replied, "because thou didst see a unicorn."

Slowly, Fess turned toward the snow-white animal. "Unicorns… are mythical…"

"Mayhap she would think the same of iron horses," Cordelia said, irritated.

The unicorn was eyeing Fess warily, and her nostrils were flaring.

"I can comprehend her feelings," Fess murmured.

Geoffrey exchanged a glance with Magnus. "Ought we to tell him?"

"You surely must!" Fess's head swiveled, the great eyes staring at him. "What should I know?"

"We are not sure thou shouldst." Magnus avoided Fess's eyes. "It might cause thee to have another seizure."

Fess was still a moment, then said, "I have braced my system for my senses tell me things that I know cannot be true. Since I am prepared, I will not have a seizure. Tell me, please."

Magnus exchanged one last glance with Geoffrey, then gestured about them. "Dost thou see signs of fire?"

"Of course. This village has suffered a major conflagration. No doubt that is why its people have fled."

"But it has burned out." Gregory tugged at Fess's mane in a bid for attention. "Would not they have come back?"

Fess was still a moment, then nodded. "One would think so, yes. Why do you think they have not?"

Gregory exchanged glances with Magnus, then said, " 'Tis because of what did cause this fire."

"And what was that?" Fess's tone hardened.

The boys locked gazes with one another, and Magnus said, "There is no easy way to say it." He turned to Fess. "It was a dragon."

Fess stood very still. They all watched, waiting in apprehension.

Finally, the robot said, "I have accepted the idea. I do not understand how a dragon may exist, but I recognize the possibility."