"The Amulet, Bartimaeus."

I raised my hand, and with a heavy, rather theatrical sigh, took hold of the Amulet. Then I leaped to my left. At the same time, I released the Seal on the door. Faquarl gave a tut of annoyance and began a gesture. As he did so he was hit square on by a particularly powerful Detonation that came shooting through the empty gap where the Seal had been. It sent him backward into the fireplace and the brickwork collapsed upon him.

I smashed my way into the greenhouse just as Jabor stepped through the gap into the kitchen. As Faquarl emerged from the rubble, I was breaking out into the garden. The three sentinels converged on me, eyes wide and legs rotating. Scything claws appeared at the ends of their blobby feet. I cast an Illumination of the brightest kind. The whole garden was lit up as if by an exploding sun. The sentinels' eyes were dazzled; they chittered with pain. I leaped over them and ran through the garden, dodging bolts of magic that sprang from the house, incinerating trees.

At the far end of the garden, between a compost heap and a motorized lawn—mower, I vaulted the wall. I tore through the blue latticework of magical nodes, leaving a boy—shaped hole. Instantly alarm bells began ringing all over the grounds.

I hit the pavement outside, the Amulet bouncing and banging on my chest. On the other side of the wall I heard the sound of galloping hooves. It was high time I made a change.

Peregrine falcons are the fastest birds on record. They can attain a speed of two hundred kilometers an hour in diving flight. Rarely has one achieved this horizontally over the roofs of North London. Some would even doubt that this was possible, particularly while carrying a weighty amulet around its neck. Suffice it to say, however, that when Faquarl and Jabor landed in the Hampstead backstreet, creating an invisible obstruction that was immediately hit by a speeding moving van, I was nowhere to be seen. I was long gone.

"Above all," said his master, "there is one fact that we must drive into your wretched little skull now so that you never afterward forget. Can you guess what that fact is?"

"No, sir," the boy said.

"No?" The bristling eyebrows shot up in mock surprise. Mesmerized, the boy watched them disappear under the hanging white thatch of hair. There, almost coyly, they remained just out of sight for a moment, before suddenly descending with a terrible finality and weight. "No. Well then…" The magician bent forward in his chair. "I shall tell you."

With a slow, deliberate motion, he placed his hands together so that the fingertips formed a steepled arch, which he pointed at the boy.

"Remember this," he said in a soft voice. "Demons are very wicked. They will hurt you if they can. Do you understand this?"

The boy was still watching the eyebrows. He could not wrench his gaze away from them. Now they were furrowed sternly downward, two sharp arrowheads meeting. They moved with a quite remarkable agility—up, down, tilting, arching, sometimes together, sometimes singly. With their parody of independent life they exerted a strange fascination on the boy. Besides, he found studying them infinitely preferable to meeting his master's gaze.

The magician coughed dangerously. "Do you understand?"

"Oh—yes, sir."

"Well now, you say yes, and I am sure you mean yes—and yet…" One eyebrow inched skyward musingly. "And yet I do not feel convinced that you really, truly understand!"

"Oh, yes, sir; yes, I do, sir. Demons are wicked and they are hurtful and they will hurt you if you let them, sir." The boy fidgeted anxiously on his cushion. He was eager to prove that he had been listening well. Outside, the summer sun was beating on the grass and the hot pavement; an ice—cream van had passed merrily under the window five minutes before. But only a bright rim of pure daylight skirted the heavy red curtains of the magician's room; the air within was stuffy and thick. The boy wished for the lesson to be over, to be allowed to go.

"I have listened very carefully, sir," he said.

His master nodded. "Have you ever seen a demon?" he asked.

"No, sir. I mean, only in books."

"Stand up."

The boy stood quickly, one foot almost slipping on his cushion. He waited awkwardly, hands at his sides. His master indicated a door behind him with a casual finger. "You know what's through there?"

"Your study, sir."

"Good. Go down the steps and cross the room. At the far end you'll find my desk. On the desk is a box. In the box is a pair of spectacles. Put them on and come back to me. Got that?"

"Yes, sir."

"Very well then. Off you go."

Under his master's watchful eye, the boy crossed to the door, which was made of a dark, unpainted wood with many whorls and grains. He had to struggle to turn the heavy brass knob, but the coolness of its touch pleased him. The door swung open soundlessly on oiled hinges and the boy stepped through to find himself at the top of a carpeted staircase. The walls were elegantly papered with a flowery pattern. A small window halfway down let in a friendly stream of sunlight.

The boy descended carefully, one step at a time. The silence and sunlight reassured him and quelled some of his fears. Never having been beyond this point before, he had nothing but nursery stories to furnish his ideas of what might be waiting in his master's study. Terrible images of stuffed crocodiles and bottled eyeballs sprang garishly into his mind. Furiously he drove them out again. He would not be afraid.

At the foot of the staircase was another door, similar to the first, but smaller and decorated, in its center, with a five—sided star painted in red. The boy turned the knob and pushed: the door opened reluctantly, sticking on the thick carpet. When the gap was wide enough the boy passed through into the study.

Unconsciously he had held his breath as he entered; now he let it out again, almost with a sense of disappointment. It was all so ordinary. A long room lined with books on either side. At the far end a great wooden desk with a padded leather chair set behind it. Pens on the table, a few papers, an old computer, a small metal box. The window beyond looked out toward a horse chestnut tree adorned with the full splendor of summer. The light in the room had a sweet greenish tint.

The boy made for the table.

Halfway there, he stopped and looked behind him.

Nothing. Yet he'd had the strangest feeling… For some reason the slightly open door, through which he had entered only a moment before, now gave him an unsettled sensation. He wished that he had thought to close it after him.

He shook his head. No need. He was going back through it in a matter of seconds.

Four hasty steps took him to the edge of the table. He looked round again. Surely there had been a noise…

The room was empty. The boy listened as intently as a rabbit in a covert. No, there was nothing to hear except faint sounds of distant traffic.

Wide—eyed, breathing hard, the boy turned to the table. The metal box glinted in the sun. He reached for it across the leather surface of the desk. This was not strictly necessary—he could have walked round to the other side of the desk and picked the box up easily—but somehow he wanted to save time, grab what he'd come for, and get out. He leaned over the table and stretched out his hand, but the box remained obstinately just out of reach. The boy rocked forward, swung his fingertips out wildly. They missed the box, but his flailing arm knocked over a small pot of pens. The pens sprayed across the leather.

The boy felt a bead of sweat trickle under his arm. Frantically, he began to collect up the pens and stuff them back into the pot.