They stood for a while, noses pressed to the 64.gla.s.s, hoping the funny little guy would reappear. Emmy wouldn't quit barking, so eventually the cousins gave up.

"What was it, do you think?" Daisy whispered to Jesse, her eyes round with wonder.

Emmy barked once.

"I don't know, but I think Emmy does," Jesse said. "Let's get her home quick and find out." When Jesse unfastened Emmy's leash from the Chicken Box, she practically yanked his arm out of the socket dragging him down the library stairs. It was all Jesse could do to get on his bike and fit his feet on the pedals as Emmy pulled Jesse homeward, with Daisy pumping like mad to keep up with them.

The moment they shut the garage door, Emmy unmasked into a dragon. The first breathless words out of her mouth were "That was a shelf elf!" "That was a shelf elf!"

"Really?" asked Daisy.

"What's a shelf elf?" asked Jesse. "And can it help us find the professor?"

Emmy squeezed her eyes shut in thought, then opened them. "Beats me." She hung her head in shame. "Some dragon I am. I have no idea what a shelf elf is or whether he can help us find the professor."

"Well, whatever he is, I think you pretty much 65.scared him away with all that barking," Daisy said.

Emmy sank down onto her haunches and looked even more miserable. "I ruin everything in the end, don't I?" she said.

Daisy said, "You were excited, that's all."

"Believe me," Jesse put in. "If I were a dog, I would have barked my head head off. That thing was off. That thing was amazing." amazing."

"He was," Daisy agreed. "And the party is tonight, so maybe we'll get a chance to see him again. And And find the book that will help us get into the tower and rescue the professor." find the book that will help us get into the tower and rescue the professor."

"But we can't just sit around until then. We need to do do something!" Jesse said. something!" Jesse said.

"If I don't do something to cool myself down," Daisy said, "my brain's going to boil over and I'm not going to be much use to anyone, including the professor. Let's go take a dunk in the brook."

"And then we can go to the barn and visit the Museum of Magic collection," Jesse said. "Remember, Miss Alodie said that's where we should go when in doubt, which we are."

After putting their bathing suits on under their shorts and throwing together a late picnic lunch, the cousins and Emmy left for the Dell. As they had done so many times before, they walked to the rear of the backyard, crawled through the tunnel in the 66.laurel bushes, and poked their heads out into the Dell. That was their name for the abandoned dairy barn and the pasturelands surrounding it, which were divided by a brook. Normally, Emmy would have transformed into a dragon the instant she emerged from the laurels, but today she had made a grudging promise to remain masked.

"Just in case Sadie Huffington has any spies lurking," Jesse said.

They walked along the brook until it widened into a crystalline pool beneath the branches of their favorite weeping willow, its delicate green fronds trailing in the water.

"Hey, Willow!" Jesse called up to it.

"Mind if we borrow a piece of your shade?" Daisy asked.

"We'll just be a few minutes," said Jesse. "Then we have things to do."

The weeping willow fluttered some of its long green fingers toward them, lightly brushing the cousins' faces. Since there wasn't even a whisper of a breeze that day, Jesse knew that this was the dryad spirit inside the tree welcoming them into his shade. Earlier in the summer, St. George had imprisoned the hobgoblin queen beneath the ground in this willow's root-ball. Neither willow nor hobgoblin had been very happy with the arrangement.

67.With his root-ball no longer weighed down by a goblin, the willow seemed positively perky now...for a weeping willow, at least.

Jesse and Daisy spread their towels out in its dappled shade and stripped down to their bathing suits.

Daisy was the first to wade in. Even in the deepest parts, the brook wasn't very deep. The water came up only to Daisy's chest, but Jesse knew it was as cold as the Arctic Ocean. She pinched her nose and ducked right under. It took Jesse a little longer to get wet. He liked to get used to the frigid water one toe at a time. But Emmy bombed ahead of him and then bounded out for a good long shake of her sopping wet coat...all over Jesse.

All three of them stayed in the freezing cold water until Daisy's lips began to turn blue, then they crawled out onto the bank to dry out and eat their lunch.

They had finished eating and Jesse and Daisy were packing up when they heard Emmy barking. She was standing on the other side of the brook, tail rigid, head raised, barking fit to bust.

The cousins gathered their things together and waded across the nearest shallow spot in the brook. Emmy turned and ran across the pasture toward 68.the barn. By the time Jesse slid the big barn door closed behind them, Emmy was already unmasked and hunkered down over the makeshift table--old planks laid across sawhorses--that held their collection.

If you didn't know any better, you would think it was just a bunch of old junk: a farmer's ancient three-legged milking stool, some rusty old horseshoes, antique hinges, animal skulls, pressed flowers, pinecones, and a crusty old metal ball about the size of a peach. The cousins called it the Sorcerer's Sphere.

Ever since the day she had hatched, the sphere had held a powerful fascination for Emmy. She reached down and plucked it up in her talons. "I like this!" she said, as if she were discovering it for the first time.

"We know you like it, Em." Jesse yawned widely and glanced at his wrist.w.a.tch. "You've always always liked it." liked it."

"Pack this," Emmy said, tossing Jesse the sphere.

Jesse barely managed to catch it two-handed. "For the party?" he asked.

"For the party," Emmy said.

Turning the rusty ball around in his hand, Jesse 69.said slowly, "I don't know, Em. We've never taken this away from the Dell."

"Do what she says," Daisy said. "If this is what Emmy thinks we need, then this is what we're taking. Thanks for the tip, Em."

"Finally!" Emmy said. "Someone who really understands me."

Jesse was hurt. "I understand you, too, Em. I was just making sure this was the right thing to do."

"Trust the ladies," Emmy said, "and pack the sphere, Jesse Tiger."

Jesse put the sphere in the backpack. "I'm packing the sphere, ladies. Are you happy?"

"For a grumpy dragon," Emmy said, "I'm practically dancing with joy."

"And does the grumpy dragon promise to make nicey-nice with the other dogs at the party?" Jesse said.

"The grumpy dragon promises," said Emmy. "I will even let them sniff my b.u.t.t."

When Uncle Joe dropped them off in front of the library, there were kids on the front walk holding cages and pet carriers, saying good night to their parents. Jesse had never seen any of the kids before. The kids he knew, Daisy's friends from school, 70.either weren't coming or were still at sleepover camp. But that was okay. Since he had moved twenty-six times in his life, he was used to strangers.

Sitting in the front seat of his old truck, Uncle Joe eyed the vast amounts of stuff they had brought with them. "You guys need any help carrying?" he asked.

"No, thanks, Poppy," Daisy told him. "We're good."

Daisy grabbed the covered dish while Jesse took charge of Emmy's leash, and they each carried a sleeping bag under one arm. Jesse wriggled into the backpack, which contained, among other things, their toothbrushes, a washcloth, the Sorcerer's Sphere, and Daisy's wildflower notebook, just in case they needed to write anything down.

Daisy gave her father a peck on the cheek. "See you tomorrow. Say good night to Mom for us."

Uncle Joe reached over and mussed Jesse's brown mop of hair, which was Uncle Joe's way of hugging. "Aunt Maggie's going to ask if you packed a comb," he said.

"Of course he did," Daisy spoke for Jesse. "And maybe he'll even use it."

Jesse and Daisy went up the front walk and 71.climbed the stone steps to the library. Daisy drew up short in the doorway. "Pee-yew. This place smells like a gorilla's armpit," she said.

It did smell like a zoo, but Jesse kind of liked it. The library was swarming and buzzing with all manner of pets and their keyed-up owners. Jesse counted at least twenty of each.

Peering out from between Jesse's legs, Emmy began to growl ominously.

"Nicey-nice," Jesse reminded her.

Daisy tugged at Jesse's sleeve and pointed. Jesse nodded. One half of the library, the adult section, had been blocked off with orange plastic tape. That was exactly where they had last seen the shelf elf.

"We've got to try and get over there," Daisy whispered to Jesse.

"I don't think we're allowed to cross the orange tape," said Jesse.

"Would you cross the tape if it meant helping the professor?" Daisy asked.

Jesse nodded. "I guess we've got to try and get over there."

From across the room, Mr. Stenson saw them and seemed eager to take leave of the little girl with the big snake coiled around her waist. Joining them, Mr. Stenson said, "Good evening, Ms.

72.Emmy! Now, this is my idea of the perfect pet. We're glad you could join us."

Emmy sat up tall and dutifully offered him her right paw. "Oh, my! What manners!" said the librarian, shaking the paw. "And would Ms. Emmy care for a party hat?"

"Sure, she would," Daisy said, with hearty enthusiasm. "Wouldn't you, Em?"

Emmy whined.

"I'll let you do the honors." Mr. Stenson handed Daisy a party hat with an elastic chin strap. Daisy knelt and fit the hat carefully on Emmy's head, then stood back to admire the effect of the sparkly silver paper princess tiara. Emmy looked up at her Keepers with reproachful eyes.

"She's the belle of the ball," Mr. Stenson said.

"She is, isn't she? Um, Mr. Stenson?" Daisy was just about to ask him whether it would be all right if they checked out the card catalog on the grown-up side of the library, but Mr. Stenson was reciting the rules for them.

"We keep the dogs on leashes and the rodents, lizards, birds, and other critters in their cages. No feeding the animals people food and no teasing, prodding, poking, or otherwise provoking the animals."

"Got it," said Daisy. "Would it be okay--" she started again.

73."Would you kids excuse me? I see more guests arriving," Mr. Stenson said as he breezed away, leaving Jesse and Daisy standing in the middle of the floor. They looked around. The long wooden reading tables had been shoved off to the sides, leaving a wide-open s.p.a.ce for kids and their pets to mill around in. One of the tables held cages filled with smaller animals, like lizards and hamsters. A single goldfish flitted nervously around in a small bowl.

"I bet no one would notice if we just sneaked over there," Daisy said.

"Since we don't have our invisible pills, I think we should probably try asking first," said Jesse. He cleared his throat and said, "h.e.l.lo, Mrs. Thackeray?"

Mrs. Thackeray, the weekend librarian, was wearing an oversize hot-pink T-shirt that declared her to be a Library G.o.ddess. She was kneeling before a cat carrier and cooing at the large tabby cat staring dismally out the small mesh window. Their party hats in disarray, the canine guests were dragging their masters toward the carrier.

"Hey, kids," said Mrs. Thackeray, not taking her eyes off the cat in the carrier. "Poor kitty. She's scared witless. Can't say that I blame her. It's a dog's world here tonight."

74."Mrs. Thackeray," Jesse said, "would it be all right if Daisy and I went over and looked at the grown-up card catalog? There's this book that we really, really need...."

Mrs. Thackeray sat back on her heels and peered at him curiously over the rhinestone rims of her eyegla.s.ses. "Why in the world would you want to do a thing like that, Jesse? You're here to party, you two! Or should I say, you three! Now, go play video games with the rest of the mob."

Most of the other kids were, sure enough, over in the computer lab, crowded around a single station whose bloops, blops, blips bloops, blops, blips , and , and zaps zaps indicated that a video tournament was underway. Jesse and Daisy dumped the backpack and their sleeping bags in the big pile along with everyone else's stuff. Jesse handed Daisy the leash. indicated that a video tournament was underway. Jesse and Daisy dumped the backpack and their sleeping bags in the big pile along with everyone else's stuff. Jesse handed Daisy the leash.

"Okay," said Jesse. "We asked nicely, and now we have to take the law into our own hands. I'm going to try and cross the orange tape and get to the card catalog. Wish me luck."

"Good luck," Daisy said solemnly, and watched him wander off casually in the direction of the orange tape. She carried their dish over to the food table and busied herself reading the labels on some of the other dishes: CLIFFORD THE BIG RED HOT DOG CHILI; WILBUR THE PIGS IN BLANKETS; BUNNICULA'S 75.CARROT c.o.c.kTAIL NIBLETS; La.s.sIE COME HOME FRIES. Daisy printed a label for their dish, HIGGLETY PIGGLETY CARAMEL CORN POPS, and set it down between CHOCOLATE CRICKETS IN TIMES SQUARE and BALTO'S MALTED MILK BALL SOUFFLe. Emmy began to whine and roll her eyes. Daisy turned around, expecting to see some dog with its nose in her b.u.t.t.

Instead she saw six dogs crouched in a shy half circle, staring at Emmy, heads all c.o.c.ked to the same side. They looked nothing if not bewildered. Daisy wondered whether the dogs sensed deep down that Emmy was not really one of them.

"My dog's a registered purebred," boasted Dewey Forbes, the poodle's owner. Daisy had known Dewey since kindergarten.

"Emmy's purebred, too," Daisy said, straightening the paper tiara.

"Yeah? Well, since when do purebred sheepdogs have forked forked tongues?" Dewey asked. tongues?" Dewey asked.

Emmy pulled in her tongue and shut her mouth with a snap. Sheepdogs didn't have emerald-green eyes, either, but apparently that detail had escaped Dewey's attention. People tended to notice the forked tongue, so Daisy always had an explanation ready. "She tried to lick a frozen water pump one winter morning and it split the 76.tip of her tongue in half," Daisy said to Dewey.

Jesse joined them. "Have you you ever tried to lick a frozen pump, Dewey?" he asked. "You should try it sometime." ever tried to lick a frozen pump, Dewey?" he asked. "You should try it sometime."

"Should not," Dewey countered. "Because that would be dumb. Your dog must not be very smart."

An offended little growl escaped Emmy.

"Poodles are the smartest breed going," Dewey said. "Watch this." He held up two fingers, and the big poodle stood at attention. "Sit, Loretta."

Loretta the poodle sat.

"Down, Loretta."

Loretta crouched on the floor.

"Roll over, Loretta."

Loretta rolled over.

Dewey folded his arms across his chest and gave them a smug, satisfied look. "So?"

"So?" Jesse said.

Daisy looked unimpressed. Emmy opened her mouth, forked tongue and all, and yawned widely.

"So? I bet your stupid fork-tongued sheepdog can't do that," Dewey said.

"Why would she even want want to?" Jesse said. "Those are boring tricks. Emmy can do to?" Jesse said. "Those are boring tricks. Emmy can do interesting interesting tricks, can't you, Emmy? Emmy, go fetch the backpack." tricks, can't you, Emmy? Emmy, go fetch the backpack."

Emmy went over to the big pile of backpacks 77.and found theirs right away. She picked it up in her mouth by the strap and trotted back to Jesse, setting it at his feet.