“They might be after someone else,” Connla says but his words are hollow. We’ve been discovered.

“Let’s pick up the pace,” Goll says, expression stern.

Run Fast’s head shoots up. “Run fast?” he asks eagerly.

“Aye,” Goll says, then grabs the boy as he starts to shoot off. “Not that fast!”

We can hear them, a pack of demons crashing through the woods, snapping off branches, knocking over smaller trees. I’ve never known demons so excited. I guess, when they attack a fort, it’s hard work. It must be frustrating, the scent of prey thick in their nostrils, having to fight their way through, often failing. But out here, in the open, they have only to hunt us down and we’re theirs for the taking. They’re like dogs after a fox.

We’re looking for a place to make a stand, somewhere we can defend. A cave would be perfect. We could squeeze in and fend them off, maybe keep them at bay for the rest of the night, then escape in the morning. But there are no caves, or at least none that we can find.

Goll comes to a halt in a small clearing. Trees have been felled here some time in the last few years. Somebody probably planned to graze animals or build a hut, in the days before the demons came. Goll looks around, assessing.

“Not here,” Connla wheezes, face dark from the strain. “Too exposed.”

“There’s nowhere better,” Goll gasps. He points to a mound of logs covered in moss. “We can start a fire. Fell more trees, stake them in the ground and sharpen the tops. Make it hard for the demons to strike all at once.”

“But…” Connla looks to the others for support, but Ronan, Lorcan and Orna are already drawing their weapons, preparing for battle. Fiachna has his axe out and is studying the trees. They know it’s hopeless, that we’re going to die. But what choice do we have? There’s nothing to do but draw our lines, wait and face those who will most certainly destroy us. Die as warriors, with pride.

I’m thinking about what spells I can use when a small hand slips into mine. I look round. Run Fast is smiling at me. “Run fast?” he whispers.

“Not now,” I sigh.

The boy frowns. “Run fast,” he says more firmly.

I shake my head. “We have to stay and fight. Can you fight? Do you know how to—”

The strange boy’s fingers grab mine tightly and his face hardens. “Run fast!” he hisses, then points with his free hand. “Worm pups!”

I start to snap at him to be quiet. Then pause. There’s a tingling sensation in Run Fast’s fingers. Some sort of magic. I look down. His hand is glowing slightly. The boy looks at it too, then up at me. “Worm pups,” he repeats, softly this time.

“Goll!” I shout. The old warrior glances at me. “We’re leaving.”

“But—”

“Don’t argue!” I move ahead with Run Fast. “We’ll die here. But I think, if we carry on, there’s…” I stop, not sure what might lie beyond, but sensing in my heart that it’s better than this.

Everybody’s looking at me now, torn between hope and suspicion.

“This place isn’t much,” Fiachna says, “but it’s defendable. If we’re caught on the run, we’re finished for sure. Are you certain…?”

“Yes,” I growl. “We have to go. Now. We’re dead if we don’t.”

“But we’ll live if we do?” Connla asks dubiously.

“Perhaps.”

It’s not enough. They don’t trust my instincts. They’re going to stay. I open my mouth to argue afresh, but then Orna lowers her knives and comes to my side. “I’m with the girl.”

“Why?” Goll asks—not a challenge, just curious.

Orna shrugs. “A feeling.”

Lorcan taps a few of his earrings with a knife tip. “I don’t feel like we’ll live if we go, but I’m sure we’ll die if we stay.”

Goll looks around at the others and asks the question with his eyes. They answer with weary glances and resigned shrugs. “So be it,” he says, sheathing his sword. “Bec—lead us.”

We run.

Sweat. Terror. The sounds of chasing demons. Almost upon us. A minute, maybe two, and we’ll be forced to stop and fight—stop and die.

The trees are thick around us. Impossible to see far. It’s dark. Too dark. I look up and notice extra branches, scraps of cloth, thatch torn from roofs, all sorts of bits and pieces scattered among the tree tops, linking the upper branches, keeping out the light of the moon and stars.

My stomach sinks. This is a trap! I was wrong. Run Fast was sent to lead us to our doom. And we fell for it. I start to shout a warning, even though it’s far too late. Then…

We burst into the open and come to a surprised halt. There’s a clear circle around us and at the centre—a ring of giant stones. Most are taller than me. Some even tower above the lanky Ronan and Connla. Set in the ground at regular intervals. Ancient, covered in moss and creepers. A place of magic, but magic from a time before ours, the time of the Old Creatures, when this country was the playground of the gods.

The demons are hot on our heels, surging up behind us, their stench foul in the air. “Come on!” Fiachna screams. We fly forward at his call, rushing to the stones, readying ourselves for battle.

We spill past the stones, into the middle of the ring. The stones won’t provide much cover but they’ll make it slightly harder for the demons to get at us and buy us a few seconds. They won’t make a real difference, but you’ve always got to live in hope. Before you die at the hands of a Fomorii.

Lorcan jumps on to a stone which fell on its side many years ago. He waves his sword over his head, screaming a challenge at the demons which are emerging from the cover of the trees. Dozens of twisted, hideous monsters. One has the body of a bear but the head of a hawk. Another looks like a wolf but its inner organs hang from its limbs. Claws, fangs, blood-red eyes. Nightmares everywhere I look.

The demons advance slowly. I assume they’re relishing the moment, prolonging it, toying with us. But then they stop and howl with anger.

As we stare at the demons beating the ground with their fists, or tearing it with their claws, cursing us in their own garbled language, Run Fast steps up behind me, lays a hand on my shoulder and says with a confident little smile, “Worm pups.”

The Old magic is too strong for the demons. They can’t come within striking distance of the stones. A few try, over the course of the night, making darting runs, heads low, howling their defiance. Each comes crashing to a halt or is thrown back as if they’d run into a wall.

I wish we knew the magic of the Old Creatures. We could build stone rings like this around every fort. Make the land safe again. But those secrets are long lost. Banba often spoke of the ancient magicians but she knew little about them, except for the tales and legends which she herself was taught as a child.

When we’ve finished laughing and cheering, we examine the stone circle in greater detail and what we find dampens our newly elated spirits. Bones. Some are from animals but most are human, stacked carefully in the centre, arranged so that the heads point west, in the direction of the setting sun. The sun guides the dead to the Otherworld and if bodies aren’t cremated, they’re usually laid out facing the path of the ever-moving orb.

The bones are more recent than the stones. Many are still dotted with scraps of flesh and hair.

“They must have been brought here after death,” Orna says. “To keep the Fomorii from bringing them back to life.”

“Perhaps,” Fiachna says. “But why not just burn them?”

“Maybe the bodies are part of the magic,” Ronan suggests. “The stones might need the power of the newly dead.”

“Even if they did,” Goll says, “what purpose would it serve? Why drag bodies here just to keep demons from overrunning a ring of stones?”

The mystery puzzles us through the night—nobody can sleep with all the screams of the demons—but it’s solved early in the morning. As the sun rises the demons retreat. But they only withdraw as far as the trees which encircle the ring. There, under the shade of the rough shelter, they stop and leer viciously at us, pounding the earth with a terrible, steady, threatening rhythm.