The choice had been made for him. David could not hesitate. He forced himself through the gap in the wall and into the darkness just as the world that he had left behind became an inferno.

THE BRICKS AND MORTAR were gone. There was now rough bark beneath David’s fingers. He was inside the trunk of a tree, before him an arched hole, beyond which lay shadowy woods. Leaves fell, descending in slow spirals to the forest floor. Thorny bushes and stinging nettles provided low cover, but there were no flowers that David could see. It was a landscape composed of greens and browns. Everything appeared to be illuminated by a strange half-light, as though dawn was just approaching or the day was at last drawing to its close.

David stayed in the darkness of the trunk, unmoving. His mother’s voice was gone, and now there was only the barely heard sound of leaf glancing against leaf and the distant rushing of water over rocks. There was no sign of the German plane, no indication that it had ever even existed. He was tempted to turn back, to run to the house and wake his father in order to tell him of what he had seen. But what could he say, and why would his father believe him after all that had occurred that day? He needed proof, some token of this new world.

And so David emerged from the hollow of the tree trunk. The sky above was starless, the constellations hidden by heavy clouds. The air smelled fresh and clean to him at first, but as he breathed deeply he caught a hint of something else, something less pleasant. David could almost taste it upon his tongue: a metallic sensation composed of copper and decay. It reminded him of the day he and his father had found a dead cat by the side of the road, its fur torn and its insides exposed. The cat had smelled a lot like the night air in the new land. David shivered, and only partly from the cold.

Suddenly he was aware of a great roaring noise from behind him, and a sensation of heat at his back. He threw himself to the ground and rolled away as the trunk of the tree began to distend, the hollow widening until it resembled the entrance to a great, bark-lined cave. Flames flickered deep within it, and then, like a mouth expelling a tasteless piece of food, it spit forth part of the burning fuselage of the German bomber, the body of one of its crew still trapped in the wreckage of the gondola beneath, its machine gun pointing at David. The wreckage tore a blackened, burning path through the undergrowth before it came to rest in a clearing, still spewing smoke and fumes as the flames fed upon it.

David stood, brushing leaves and dirt from his clothing. He tried to approach the burning plane. It was a Ju 88; he could tell from the gondola. He could see the remains of the gunner, now almost entirely wreathed in flames. He wondered if any of the crew had survived. The body of the trapped aviator lay pressed against the cracked glass of the gondola, his mouth grinning white in his charred skull. David had never seen death up close before, not like this, not violent and smelly and turning to black. He could not help thinking of the German’s final moments, trapped in the searing heat, his skin burning. He experienced a wave of pity for the dead man, whose name he would never know.

Something whizzed past his ear like the warm passage of a night insect, followed almost immediately by a cracking noise. A second insect buzzed past, but by then David was already lying flat on the ground, crawling for cover as the ammunition for the.303 ignited. He found a depression in the earth and threw himself into it, covering his head with his hands and trying to keep himself as flat as he could until the hail of bullets had ceased. Only when he was certain that the ammunition was entirely spent did he dare to raise his head again. He stood warily and watched as flames and sparks shot into the skies above. For the first time, he got some sense of how huge were the trees in this forest, taller and wider than even the oldest of oaks in the woods back home. Their trunks were gray and entirely without branches until, at least one hundred feet above his head, they exploded into massive, mostly bare crowns.

A black, boxlike object had separated from the main body of the shattered plane and now lay, smoking slightly, not far from where David stood. It looked like an old camera, but with wheels on its side. He could make out the word “Blickwinkel” marked on one of the wheels. Beneath it was a label reading “Auf Farbglas Ein.”

It was a bombsight. David had seen pictures of them. This was what the German fliers had used to pick out their targets on the ground. Perhaps that had even been the task of the man who now lay burning in the wreckage, for the city would have passed beneath him as he lay prone in the gondola. Some of David’s pity for the dead man seeped away. The bombsight made what they had been doing seem more real, somehow, more awful. He thought of the families huddled in their Anderson shelters, the children crying and the adults hoping that whatever descended would strike far away from them, or the crowds gathered together in the Underground stations, listening to the explosions, dust and dirt falling on their heads as the bombs shook the ground above.

And they would be the lucky ones.

He kicked out hard at the bombsight, connecting with a perfect right foot shot, and felt a surge of satisfaction as he heard the sound of broken glass from within and knew the delicate lenses had shattered.

Now that the excitement was over, David put his hands in the pockets of his dressing gown and tried to take in a little more of his surroundings. Some four or five steps beyond where he was, four bright purple flowers stood tall above the grass. They were the first signs of real color he had seen so far. Their leaves were yellow and orange, and the hearts of the flowers themselves looked to David like the faces of sleeping children. Even in the murk of the forest, he thought he could discern their closed eyelids, the slightly opened mouths, the twin holes of their nostrils. They were unlike any flower that he had ever seen before. If he could take one and give it to his father, then he might be able to convince him that this place truly existed.

David approached the flowers, dead leaves crunching beneath his feet. He was almost upon them when the eyelids of one of the flowers opened, revealing small yellow eyes. Then its lips parted and it emitted a shriek. Instantly, the other flowers awoke, and then, almost as one, they closed their leaves around themselves, revealing hard, barbed undersides that glistened faintly with a sticky residue. Something told David that it would be a bad idea to touch those barbs. He thought of nettles, and poison ivy. They were bad enough, but who knew what poisons the plants here might use to defend themselves?

David’s nose wrinkled. The wind was blowing the stink of the burning aircraft away from him, and its stench had now been replaced by another. The metallic smell that he had detected earlier was stronger here. He took a few steps deeper into the forest and saw an uneven formation under the fallen leaves, spots of blue and red suggesting something lay barely concealed beneath. It was roughly the shape of a man. David drew closer and saw clothing, and fur beneath it. His brow furrowed. It was an animal, an animal wearing clothes. It had clawed fingers and legs like those of a dog. David tried to glimpse its face, but there was none. Its head had been cleanly severed from the body, and recently too, for a long spray of arterial blood still lay upon the forest floor.

David covered his mouth so that he would not be sick. The sight of two corpses in as many minutes was making his stomach churn. He stepped away from the body and turned back toward his tree. As he did so, the great hole in the trunk disappeared, the tree shrinking to its previous size and the bark seeming to grow over the gap while he watched, entirely covering the passage back to his own world. It became just one more tree in a forest of great trees, each hardly different from the next. David touched his fingers to the wood, pressing and knocking, hoping to find some way of reopening the portal back to his old life, but nothing happened. He almost cried, but he knew that if he began crying, all would be lost. He would be just a small boy, powerless and afraid, far from home. Instead, he looked around him and found the tip of a large, flat rock erupting from the dirt. He dug it free and, using its sharpest edge, he chipped at the trunk of the tree: once, then again, over and over until the bark fragmented and fell to the ground. David thought that he felt the tree shudder, the way a person might if he had suddenly experienced a severe shock. The whiteness of the inner pulp turned to red, and what looked very much like blood began to seep from the wound, flowing down the channels and crevasses of the bark and dripping onto the ground beneath.