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Ada found a forgotten windmill. She was walking with PJ in the patch of bush between her house and Toby Layton’s. She was already nine and still wearing her jumper back to front, but PJ was old and broad as a wombat, with only three legs that worked, so he waddled along slowly, and Ada often had to stop and wait for him. She swished a stick, absentmindedly whacking at the tea-tree and singing over and over again, Did you ever come to meet me, Farmer Joe, Farmer Joe? She couldn’t remember the next line. She wasn’t even sure the words were right, but because she was alone, and because it was her travelling-along song, she sang the words as loudly and confidently as a trumpet. The bush was unaffected by her song. This was the great consolation that trees provided—they heard her without commenting.

It was early enough that the air was cool and there was a damp, silvery gleam and rustle to the leaves. The song ribboned ahead, as if escaping, drawing her through the thin trees and pale sky as if she belonged naturally to the landscape—as if she was not the child Ada Bloom with a bunk bed and a green bike and words to speak or homework to do, but a creature whose soul could rise with the trees and enter by the breath of song.

Ada followed her song deeper into the bush, until the windmill loomed up before her. Its tin blades creaked and flapped like startled elbows, causing Ada to swallow her song whole. She gathered herself, with some indignation. She had never seen this windmill or the little clearing it presided over. Was it right that it should be there, hiding away in her own patch of forest? Its stature made it seem important, but also forbidding, like the headmaster at school, whose appearance caused in Ada the same sort of disobedient urge. And if Mr Gray had been a windmill instead of an old headmaster this was exactly the sort of windmill he would be: stern as a judge, with a ghostly clanging air and rotting on the inside.

The windmill was cross, Ada could tell, because it had been forgotten. It was terrible to be forgotten. As if it was a curse to even think it, Ada dropped to her knees and scratched her name into the dirt with her stick. Ada is here.

But the windmill didn’t care. It was bitter and stricken and so haunted with olden times and so neglected by current ones that its struts were as rutted and splintering as old people’s bones. From its damp wooden skeleton came the stink of rot. Ada never wanted to become an old person. The old windmill was secretly forlorn about it and probably dying. Yet it wasn’t this aspect of death that scared Ada, but more the sense that the old windmill was possessed of a life and that, with the remaining shreds of it, it rattled and stood, guarding its last tenure with mad gusts of faltering pride. Ada moved forward to touch it, half hoping for a nasty great-aunt shriek. Instead, and in a malevolent silence, it revealed a great never-ending hole, which it straddled, and from which came a chill breath of buried darkness. Ada stepped back.

PJ gave the hole a wary sniff. This hole definitely had some intent; it was square and lined with wood, and fixed to one side was a wooden ladder whose first rungs had almost rotted away.

The ladder went down further than Ada could see. She dropped her stick in and watched the hole swallow it down so far she couldn’t hear it land.

Her mind began to dance. What lay at the bottom of the hole? Did it have a bottom, or did it go right through the earth into foreign nights? What would happen to her if she dropped down the hole? A pleasant tremor of danger passed through her; she squatted next to PJ for comfort. Then she stood up and pushed some dried-up leaves and twigs into the hole with her foot and leaned over to watch them fall. The sight made her almost black with dizziness and she ran back through the bush, as if something was chasing her, even if it was just the thought of climbing down into that hole.

She ran home to get the others. There was no point if nobody saw her do it.

Tilly was at the window, reading. She uncurled her legs and frowned disbelievingly. ‘Don’t tell Mum or we won’t be allowed to go there.’ She sighed, as if weary of the hole before she had even seen it.

Let her be bored. Tilly was already seventeen and had taken on grown-up airs. Ada went to round up the littlies, and Raff Cavallo and Ben. Then Tilly decided she would come, after all. Ada led them through the bush to the old windmill. She planned to show Raff Cavallo her trees. Especially William Blake, who was the largest, a blue gum. Ada had found names for the trees on the spines of books on her mother’s bookshelf. In her mind, Emily Dickinson, who was a black-tailed wallaby, would stand nearby, marvelling at Ada’s courage.

But Emily Dickinson wasn’t there, and Ada didn’t tell Raff Cavallo anything about William Blake. Instead, as they all followed her through the bush, she bloated up with a shy sort of importance, so that she marched irreverently like a grown up, ignoring the trees, even William Blake.

When Tilly saw the endless hole, she pretended it wasn’t anything. She said it was only a mineshaft left over from the gold rush. She walked back through the bush without even dropping a stone in the hole. Ada watched her disappear into the tea-tree and fumed. Tilly had ruined the hole’s mystery. She had named it, even though it was too full of gloom and portent to be gathered up into a name.

Raff watched her go too. He watched her intently for ages, and then he jerked his head away as if he’d been stung. He picked up a stone and flung it at the windmill blades, which it hit and ricocheted off. None of the others cared though. It was clear that the most thrilling way to use the hole was to dare to climb down the rotting ladder and to see how far it went.

‘I’ll go down first, since I am the one who discovered it,’ Ada declared. If she went down first, before the big boys, everyone would know that Ada Bloom was someone.

The hardest part was that the first rungs were rotting. If her foot slipped or a rung gave way, then she would fall down the hole like that stick. She went as fast as she could, so as to not leave her weight anywhere for too long. Tilly was wrong—the hole was alive, swarming with secret blackness and doom. Ada could feel it. Hidden there were the earth’s very insides: the unseen, long-silenced, rattling bones of life’s endings. And it reached up and around her with a cold-tongue silence. She drew herself into a tight fist of concentration and went deeper. Down into elsewhere, while the world above her faded and the bush sounds hushed, and the daylight shrunk itself into a heartbeat of brightness above her.

Ben was shouting at her. The panic in his voice came chasing her down the hole.

Her stomach unfurled. If she didn’t get up right away, she would fall. She raced against the old windmill, against its endless, obliterating hole. A monstrous, unholy death suddenly had her within its grasp.

She reached the top and wriggled out, blinking in the light and gasping with relief.

Ben glared at her. ‘You shouldn’t have done that, Ada,’ he said.

But Ada was elated. She had gone so close to death and escaped it. She gazed up triumphantly at Raff Cavallo. For one glorious moment their grins burst together in a conspiratorial fire, but in the same instant his grin rode above hers, mocked it with faint amusement and then trampled it with a snort of laughter. ‘Crazy kid,’ he said, ‘You could have died down there.’