I remembered the Witchwood arrow, lying at the bottom of a ditch, and my heart constricted. “I know,” I whispered. “But I have to try. I’ve come this far. I’m not giving up now.”

“If Machina has stolen your brother, he must be waiting for you,” the old man said, leaning forward. “He wants you for something. I can feel the power in you, my girl, but it will not be enough. The Iron King is a master of manipulation. He will use you to further his own schemes, and you will not be able to resist. Go home, girl. Forget what you have lost and go home.”

“Forget?” I thought of my friends, who had sacrificed everything to see me this far. Puck. The Elder Dryad. Ash. “No,” I murmured, a lump forming in my throat. “I can never forget. Even if it’s hopeless, I have to go on. I owe everyone that much.”

“Foolish girl,” the old man growled. “I know more about Machina than anyone—his ways, his power, the way his mind works—and yet you still will not hear me. Very well. Rush to your doom, like everyone who came before you. You will see, as I did, far too late. Machina cannot be defeated. I only wish I’d listened to my councilors when they told me as much.”

“You tried to defeat him?” I stared, trying to imagine the frail old man fighting anyone and failing. “When? Why?”

“Because,” the old man explained patiently, “I was once the Iron King.

“My name is Ferrum,” the old man explained into my shocked silence. “As you no doubt noticed, I am old. Older than that whelp Machina, older than all of the iron fey. I was the first, you see, born of the forges, when mankind first began to experiment with iron. I rose from their imagination, from their ambition to conquer the world with a metal that could slice through bronze like paper. I was there when the world started to shift, when humans took their first steps out of the Dark Ages into civilization.

“For many years, I thought I was alone. But mankind is never satisfied—he is always reaching, always trying for something better. Others came, others like me, risen from these dreams of a new world. They accepted me as their king, and for centuries, we remained hidden, isolated from the rest of the fey. I realized, beyond a doubt, that if the courts knew of our existence, they would unite to destroy us.

“Then, with the invention of computers, the gremlins came, and the bugs. Given life by the fear of monsters lurking in machines, these were more chaotic than the other fey, violent and destructive. They spread to every part of the world. As technology became a driving force in every country, powerful new fey rose into existence. Virus. Glitch. And Machina, the most powerful of all. He was not content to sit and hide. His plan was conquest, to spread throughout the Nevernever like a virus, destroying all who opposed him. He was my First—my most powerful lieutenant—and we clashed on several occasions. My advisers told me to banish him, to imprison him, even to kill him. They were afraid of him, and rightly so, but I was blind to the danger.

“Of course, it was only a matter of time before Machina turned on me. Gathering an army of like-minded fey to his side, he attacked the fortress from within, slaughtering all who were loyal to me. My forces fought back, but we were old and obsolete, no match for Machina’s cruel army.

“In the end, I sat on my throne and watched him approach, knowing I was going to die. But, as Machina threw me to the floor, he laughed and said he would not kill me. He would let me fade away a bit at a time, becoming obscure and forgotten, until no one remembered my name or who I was. And, as he settled back upon my throne, I felt my power slip away and flow into Machina, acknowledging him as the new Iron King.

“So, now I live here.” Ferrum gestured to the cavern and the pack rats milling about. “In a forgotten cave, sitting on a throne made of garbage, king of the mighty trash collectors. A noble title, is it not?” His lips twisted into a bitter smile. “These creatures are very loyal, bringing me offerings that I cannot use, making me ruler of this junk heap. They have accepted me as their king, but what good is that? They cannot give me back my throne, and yet they are the only ones that keep me from fading away. I cannot die, but I can hardly bear to live, knowing what I’ve lost. What was stolen from me. And Machina is the one who designed it all!”

He slumped on his throne and buried his face in his hands. The pack rats shuffled forward, patting him, making worried chittering sounds. Watching him, I felt a surge of sympathy and disgust.

“I’ve lost things, too,” I said, over the sound of his quiet sobbing. “Machina has stolen a lot from me. But I’m not going to sit on a chair and wait for him. I’ll confront him, invincible or not, and somehow I’ll take back what’s mine. Or I’ll die trying. Either way, I’m not giving up.”

He stared at me through his fingers, his frail form shaking with tears. He sniffed and lowered his hands, his face sullen and dark.

“Go, then,” Ferrum whispered, shooing me away. “I cannot sway you. Perhaps a single unarmed girl will succeed where an entire army has failed.” He laughed then, bitter and petulant, and I felt a flicker of annoyance. “Good luck to you, foolish one. If you will not listen to me, you are welcome here no longer. My subjects will take you under his fortress, through the secret tunnels that honeycomb the land. It’s the quickest way to rush to your destruction. Now, go. I am through with you.”

I didn’t bow. I didn’t thank him for his help. I only turned and followed the pack rats out of the cave, feeling the hateful glare of the deposed king on my back.

MORE TUNNELS. THE BRIEF respite with the last Iron King wasn’t enough to stave off my exhaustion. We rested infrequently, and I caught what little sleep I could. The pack rats gave me some strange mushrooms to chew on, tiny white things that glowed in the dark and tasted like mold, but allowed me to see in pitch blackness as if it were twilight. This was a good thing, because my flashlight eventually flickered and died, and no one offered fresh batteries.

I lost track of time. All the caverns and tunnels seemed to meld together into one giant, impossible maze. I knew that, even if I did get into Machina’s fortress and rescue Ethan, I wouldn’t be getting out the same way.

The tunnel fell away, and suddenly I stood on a stone bridge across a vast precipice, jagged rocks spearing up from the bottom. Around me, on the walls and ceiling, hanging precariously close to the bridge, massive iron gears turned and creaked, making the ground vibrate. The closest gears were easily three times my height; some were even larger. It was like being inside a giant clock, and the noise was deafening.

We must be under Machina’s fortress, I thought, gazing around in awe. Wonder what those huge gears are for?

There was a tug on my arm, and I turned to see the lead pack rat point across the bridge, his jabbering lost in the grinding noise of the room. I understood. They had taken me as far as they could go. Now the last part of the trek would be on my own.

I nodded to show I understood and started forward, when he grabbed my hand. Holding my wrist, he beckoned to his pack rats, chattering at them. Two waddled forward, reaching back for some item on their humps.

“It’s okay,” I told them. “I don’t need any—”

My voice died away. The first pack rat drew out a long sheath with a familiar hilt, gleaming blue-black in the darkness. I caught my breath. “Is that…?”

He handed it over solemnly. Grasping the hilt, I pulled the blade free, washing the chamber in pale blue light. Steam writhed on the edge of Ash’s blade, and a lump caught in my throat.

Oh, Ash.

I sheathed the blade and fastened it around my waist, grimly tightening the belt. “I appreciate this,” I told the pack rats, unsure if they understood. They chattered at me and still didn’t move, and the leader pointed at the second, smaller pack rat who’d approached. He blinked and reached back, drawing forward a slightly battered bow and—

For the second time, my heart stopped. The pack rat held up the Witchwood arrow, slimy and covered with oil, but otherwise intact. I took it reverently, my mind spinning. They could have given it to Ferrum, but they hadn’t, saving it for me all this time. The arrow pulsed in my hands, still alive and deadly.

I didn’t think. I dropped to my knees and hugged the pack rats, both the leader and the small one. They squeaked in surprise. Their lumps poked my skin, making it impossible to get my arms around them completely, but I didn’t care. When I rose, I thought the leader was blushing, though it was difficult to see in the darkness, and the small one grinned from ear to ear.

“Thank you,” I said, putting as much sincerity into my voice as I could. “Really, ‘thank you’ isn’t enough, but it’s all I have. You guys are amazing.”

They jabbered at me and patted my hands. I wished I knew what they were saying. Then, with a sharp bark from the leader, they turned and faded into the tunnels. The small one looked back once, his eyes bright in the gloom, and then they were gone.

I straightened, tucking the arrow into my belt much as Ash had done. Gripping the bow, and with Ash’s sword hanging from my waist, I stepped beneath Machina’s tower.

I FOLLOWED THE WALKWAY, which turned from stone to iron grating, through the giant maze of clockwork, setting my teeth against the grinding of metal on metal. I found a twisting iron staircase and followed it up to a trapdoor, which opened with a ringing bang. I winced and peeked out cautiously.

Nothing. The room I stared into was empty, save for the enormous boiler ovens that glowed red and filled the air with hissing steam.

“All right,” I muttered, climbing out of the floor. My face and shirt were already drenched with sweat from the shimmering heat. “I’m inside. Where to now, I wonder?”

Up.

The thought came unbidden, and yet I knew it was right. Machina, and Ethan, would be at the top of the tower.

Clanking footsteps caught my attention, and I ducked behind one of the boilers, ignoring the searing heat radiating from the metal. Several figures entered the room, short and stocky and dressed in bulky canvas suits like firemen. They wore breathing apparatus that covered their entire faces, a pair of tubes snaking from the mouth to some kind of tank on their back. They stomped among the boilers, pinging on them with wrenches, checking the numerous pipes and valves. A large ring of keys dangled from each of their belts, jingling as they moved. As I scrambled back to an isolated corner, an idea floated to mind.

I followed them, staying hidden in the steam and shadows, observing how they worked. The workers didn’t converse or speak to one another, being too caught up in their own work, which suited me fine. One broke off from the rest of the group, which paid him no attention as he wandered off into the steam. I trailed him down a hallway made of pipes, watching as he bent to check a hissing crack in the metal, and snuck up behind him.

Drawing Ash’s sword, I waited until he turned around before stepping up and pressing the point of the blade against his chest. The worker jumped and scuttled backward, but the network of pipes trapped him between me and the exit. I stepped forward and angled the blade at his throat.

“Don’t move,” I snarled as fiercely as I could. He nodded and held up his gloved hands. My heart pounded, but I rushed on, poking at him with the blade. “Do exactly as I say and I won’t kill you, all right? Take off your suit.”

He obeyed, shedding his outer clothes and taking off the mask, revealing a sweaty little man with a thick black beard. A dwarf, and an ordinary-looking one at that; no steel skin, no cables coming out of his head, nothing to mark him as an iron fey. He glared at me with coal-black eyes, his arms rippling with muscle, and broke into a sneer.

“Come at last, have you?” He spat on the ground near a pipe, where it sizzled noisily. “We were all wondering what route you’d end up taking. Well, if you’re going to kill me, girl, get it over with.”

“I’m not here to kill anyone,” I said carefully, keeping the sword trained on him as I’d seen Ash do. “I’m only here for my brother.”

The dwarf snorted. “He’s upstairs in the throne room with Machina. Top west tower. Good luck getting to him.”

I narrowed my eyes. “You’re being awfully helpful. Why should I believe you?”

“Bah, we don’t care about Machina or your whiny brother, girl.” The dwarf hawked and spat on a pipe, where it bubbled like acid. “Our job is to keep this place running, not play court with a bunch of snotty aristocrats. Machina’s business is his own, and I’ll ask you to keep me out of it.”

“So, you’re not going to stop me?”

“Do you have lead in your ears? I don’t care what you do, girl! So kill me or leave me the hell alone, would you? I won’t get in your way, if you don’t get in mine.”

“All right.” I lowered the sword. “But I’ll need your suit.”

“Fine, take it.” The dwarf kicked it toward me with a steel-toed boot. “We’ve got several. Now, can I get back to work, or do you have more inane demands to keep me from my job?”

I hesitated. I didn’t want to hurt him, but I couldn’t leave him running loose. No matter what he said, he could tell the other workers, and I was pretty sure I couldn’t fight off all of them. I looked around and saw another trapdoor, like the one I’d come up from a few feet away.

I pointed at it with the sword. “Open that and get down there.”

“Into the Cogworks?”

“Leave your boots. And your keys.”

He glowered, and I raised my sword, ready to slash if he lunged at me. But the dwarf growled a curse, stalked over to the metal grate, and shoved a key into the lock. Pushing it open with a bang, he wrenched off his boots and stomped down the twisting staircase, making it ring with every step. With the dwarf glaring up at me, I shut the door and locked it, ignoring the guilt that gnawed my insides.