“Ah, but that’s exactly what I think it is:nothing. I believe that I’ve solved one of the oldest conundrums of natural philosophy by creating and proving the existence of a vacuum! It completely invalidates Vacher’s theories and means that Ládin was actually a genius. Blasted elves always seem to be right.”

Nasuada struggled to remain cordial as she asked, “What purpose does it serve, though?”

“Purpose?” Orrin looked at her with genuine astonishment. “None, of course. At least not that I can think of. However, this will help us to understand the mechanics of our world, how and why things happen. It’s a wondrous discovery. Who knows what else it might lead to?” While he spoke, he emptied the tube and carefully placed it in a velvet-padded box that held similar delicate instruments. “The prospect that truly excites me, though, is of using magic to ferret out nature’s secrets. Why, just yesterday, with a single spell, Trianna helped me to discover two entirely new gases. Imagine what could be learned if magic were systematically applied to the disciplines of natural philosophy. I’m considering learning magic myself, if I have the talent for it, and if I can convince some magic users to divulge their knowledge. It’s a pity that your Dragon Rider, Eragon, didn’t accompany you here; I’m sure that he could help me.”

Looking at Farica, Nasuada said, “Wait for me outside.” The woman curtsied and then departed. Once Nasuada heard the door to the laboratory close, she said, “Orrin. Have you taken leave of your senses?”

“Whatever do you mean?”

“While you spend your time locked in here conducting experiments that no one understands—endangering your well-being in the process—your country totters on the brink of war. A myriad issues await your decision, and you stand here blowing smoke and playing with quicksilver?”

His face hardened. “I am quite aware of my duties, Nasuada. You may lead the Varden, but I’m still king of Surda, and you would do well to recall that before you speak so disrespectfully. Need I remind you that your sanctuary here depends on my continued goodwill?”

She knew it was an idle threat; many of the Surdan people had relatives in the Varden, and vice versa. They were too closely linked for either of them to abandon the other. No, the real reason that Orrin had taken offense was the question of authority. Since it was nigh impossible to keep large groups of armed warriors at the ready over extended periods of time—as Nasuada had learned, feeding that many inactive people was a logistical nightmare—the Varden had begun taking jobs, starting farms, and otherwise assimilating into their host country.Where will that leave me eventually? As the leader of a nonexistent army? A general or councilor under Orrin? Her position was precarious. If she moved too quickly or with too much initiative, Orrin would perceive it as a threat and turn against her, especially now that she was cloaked in the glamour of the Varden’s victory in Farthen Dûr. But if she waited too long, they would lose their chance to exploit Galbatorix’s momentary weakness. Her only advantage over the maze of opposition was her command of the one element that had instigated this act of the play: Eragon and Saphira.

She said, “I don’t seek to undermine your command, Orrin. That was never my intention, and I apologize if it appeared that way.” He bowed his neck with a stiff bob. Unsure of how to continue, she leaned on her fingertips against the lip of the bench. “It’s only . . . so many things must be done. I work night and day—I keep a tablet beside my bed for notes—and yet I never catch up; I feel as if we are always balanced on the brink of disaster.”

Orrin picked up a pestle stained black from use and rolled it between his palms with a steady, hypnotic rhythm. “Before you came here . . . No, that’s not right. Before your Rider materialized fully formed from the ethers like Moratensis from his fountain, I expected to live my life as my father and grandfather before me. That is, opposing Galbatorix in secret. You must excuse me if it takes a while to accustom myself to this new reality.”

It was as much contrition as she could expect in return. “I understand.”

He stopped the pestle in its path for a brief moment. “You are newly come to your power, whereas I have held mine for a number of years. If I may be arrogant enough to offer advice, I’ve found that it’s essential for my sanity to allocate a certain portion of the day for my own interests.”

“I couldn’t do that,” objected Nasuada. “Every moment I waste might be the moment of effort that’s needed to defeat Galbatorix.”

The pestle paused again. “You do the Varden a disservice if you insist on overworking yourself. No one can function properly without occasional peace and quiet. They don’t have to be long breaks, just five or ten minutes. You could even practice your archery, and then you would still serve your goals, albeit in a different manner. . . . That’s why I had this laboratory constructed in the first place. That’s why I blow smoke and play with quicksilver, as you put it—so that I don’t scream with frustration throughout the rest of the day.”

Despite her reluctance to surrender her view of Orrin as a feckless layabout, Nasuada could not help but acknowledge the validity of his argument. “I will keep your recommendation in mind.”

Some of his former levity returned as he smiled. “That’s all I ask.”

Walking to the window, she pushed the shutters farther open and gazed down upon Aberon, with its cries of quick-fingered merchants hawking their wares to unsuspecting customers, the clotted yellow dust blowing from the western road as a caravan approached the city gates, the air that shimmered over clay tile roofs and carried the scent of cardus weed and incense from the marble temples, and the fields that surrounded Aberon like the outstretched petals of a flower.