"Catalog?" repeated either Frank or Ernest. "You shouldn't need a catalog. The entire 100 section of a library is dedicated to philosophy and psychology, and so is the first story of our hotel, from the reception desk, which is labeled 101 for the theory of philosophy, to the concierge desk, which is labeled 175 for the ethics of recreation and leisure, to the couches over there, which are labeled 135, for dreams and mysteries, in case our guests want to take a nap or conceal something underneath the sofa cushions. The second story is the 200s, for religion, and we have a church, a cathedral, a chapel, a synagogue, a mosque, a temple, a shrine, a shuffleboard court, and Room 296, which is currently occupied by a somewhat cranky rabbi.

The third story is the social sciences, where we have placed our ballrooms and meeting rooms; the fourth story is dedicated to language, so most of our foreigners stay there. The 500s are dedicated to mathematics and science, and the sixth story is dedicated to technology, from the sauna in Room 613, which stands for the promotion of health, to Room 697, which is where we keep the controls for heating, ventilation, and air conditioning. Now, if the seventh story stands for the arts, what do you think we would find in Room 792, which stands for stage presentations?"

Violet wanted to tie her hair up in a ribbon to help her think, but she was afraid of being recognized. "A theater?" she said.

"You've obviously visited a library before," the manager said, although the children could not tell if he was complimenting them or getting suspicious. "I'm afraid that's not true of all of our guests, so when they are in need of any of our services, they ring for a concierge instead of wandering around the hotel by themselves. In the next day or so, you'll probably walk through every section of the hotel, from the astronomy observatory in Room 999 to the employees' quarters in the basement, Room 000."

"Is that where we sleep?" Klaus asked.

"Well, you're on duty twenty-four hours a day," Ernest said, or perhaps it was Frank. "But the hotel gets very quiet at night, when the guests go to sleep, or stay up all night reading. You can nap behind the desk, and when someone rings for you it will serve as an alarm clock."

Frank stopped talking, or perhaps it was Ernest, and quickly looked around the room before leaning in close to the Baudelaires. The three siblings nervously looked back at Ernest through their sunglasses, or maybe it was Frank. "Your positions as concierges," he said in his unfathomable tone, "are excellent opportunities for you to quietly observe your surroundings. People tend to treat the hotel staff as if they are invisible, so you will have the chance to see and hear quite a lot of interesting things. However, you should remember that you will also have many opportunities to be observed. Do I make myself clear?"

This time it was Violet who needed to give a safe answer. "Hmm," she said. "That's an interesting question."

Either Frank or Ernest narrowed his eyes at the oldest Baudelaire, and seemed about to say something when the Baudelaires suddenly heard some loud, piercing ringing sounds. "Aha!" the manager cried. "Your work has begun!"

The siblings followed Ernest or Frank around to the other side of the desk, and Frank or Ernest pointed to a vast network of tiny bells, each no larger than a thimble, which lined the back of a desk where knobs for drawers might otherwise be. Each bell had a number on it, from 000 to 999, with one extra bell that had no number at all. This extra bell was ringing, along with the bell numbered 371 and the bell numbered 674.

"Ring!" cried either Ernest or Frank. "Ring! I shouldn't have to tell you the bell's your signal. We can't keep our guests waiting for even an instant. You can tell which guest is ringing by the number on the bell. If the number written on the bell was 469, for example, you would know that one of our Portuguese guests required assistance. Are you paying attention? The bell marked 674 indicates our associates in the lumber industry, as the number 674 means lumber processing or wood products in the Dewey Decimal System. We can't make enemies out of important guests! The number 371 indicates educational guests. Please be nice to them, too, although they're much less important. Respond to all of our guests whenever you hear that ring!"

"But what does that unmarked bell refer to?" Klaus asked. "The Dewey Decimal System doesn't go higher than 999."

The manager frowned, as if the middle Baudelaire had given him the wrong answer. "That's the rooftop sunbathing salon," he said. "People who sunbathe aren't usually interested in library science, so they're not picky about the salon's location. Now, get moving!"

"But where shall we go first?" Violet said. "Guests have requested assistance in three places at once."

"You'll have to split up, of course," Frank or Ernest replied, as unfathomably as ever. "Each concierge will choose a guest and hurry to their location. Take the elevators-they're at 118, for force and energy."

"Excuse me, sir," said another bellboy, tapping Ernest or Frank on the shoulder. "There's a banker on the phone who wants to speak to one of the managers right away."

"I'd better get to work," the manager said, "and so should you, concierges. Off with you!"

"Off with you" is a phrase used by people who lack the courtesy to say something more polite, such as "If there's nothing else you require, I must be going," or "I'm sorry, but I'm going to have to ask you to leave, please," or even "Excuse me, but I believe you have mistaken my home for your own, and my valuable belongings for yours, and I must ask you to return the items in question to me, and leave my home, after untying me from this chair, as I am unable to do it myself, if it's not too much trouble." The children were not pleased to be dismissed so rudely, nor were they pleased to learn that their employment as concierges would involve such a complicated organizational method in an immense and confusing hotel. They were not pleased that they had not been able to discern which manager was Frank and which was Ernest, and they were not pleased to learn that The Daily Punctilio was alerting the city's citizens to the Baudelaires' arrival, and that someone might recognize them at any moment and have them arrested for crimes they had not committed. But most of all, the Baudelaires were not pleased by the notion of splitting up and doing separate errands in this perplexing hotel. They had hoped to perform their duties as concierges and flaneurs together, and with each step toward the elevators they grew more and more unhappy at the idea of leaving one another behind.

"I'll go to the rooftop sunbathing salon," Violet said, trying to be brave. "Klaus, why don't you take Room 674, and Sunny, you can take Room 371. We'll all meet up at the concierge desk when we're done."

"We'll be able to observe more this way," Klaus said hopefully. "With the three of us on three separate stories, we can find the impostor much more quickly."

"Unsafe," Sunny said, which meant something along the lines of, "I'd rather not find the impostor if I'm all by myself."

"You'll be safe, Sunny," Klaus said. "This hotel is just like a large library."

"Yes," Violet said. "And what's the worst thing that can happen in a library?"

The two younger Baudelaires did not answer her, and the three concierges stood in silence for a few moments, gazing at a small sign posted near the elevators' sliding doors. When one pair of doors finally opened, the children stepped inside and pressed the appropriate buttons for their guests' locations, and as the small elevator began to rise, the children remembered the elevator shaft at 667 Dark Avenue, which it had been necessary to climb up and down several times. The Baudelaires had learned the worst thing that could happen in an elevator shaft, which was being thrown down one by a villainous girlfriend. The Baudelaires had learned the worst thing that could happen at a lumbermill, which was being forced to cause a violent accident through the sinister power of hypnotism. And the Baudelaires had learned the worst thing that could happen at a school, which was meeting some dear friends, only to have them dragged away in a long, black automobile. The orphans learned what the worst thing was at a herpetologist's house, and what the worst thing was in a small town, and at a hospital, and at a carnival, and at the peak of a mountaintop, and in a submarine, and a cave, and within the currents of a rushing stream, and inside the trunk of a car and in a pit full of lions and in a secret passageway and many, many other sinister places they preferred not to think about at all, and throughout all these perils they had encountered, and the countless other perils besides, they had always found a library of some sort or another, where the children managed to discover the crucial information necessary to save their skins, a phrase which here means "keep them alive for the next terrible chapter in their lives." But now the Baudelaires' new home was a library-a strange one, of course, but a library nonetheless-and as the elevator took them silently through the library toward their separate destinations, they did not like to wonder what the worst thing was that could happen at a library, particularly after reading the first four words on the small, posted sign. IN case of fire, the sign read, and as the Baudelaire orphans went their separate ways, they did not like to think of that at all.