Then I came to part of the bureau which was locked: one section under the roll-top hinged at the bottom with a keyhole in the top edge. I got the keys from the door and, sure enough, one of the small ones fitted. The flap hinged down and I took out the four small drawers set behind it and set them on the working-surface of the bureau.

I stared at their contents until my legs got shaky and I had to sit down on the rickety little chair which had been half-undemeath the bureau. I put my head in my hands and I was shaking again. How much was I going to have to go through this night?

I put my hands into one of the little drawers and took out the blue box of tampons. Shaking fingers brought out the other box from the drawer. It was labelled "Hormones — male'.

Inside it were smaller boxes, neatly numbered in black biro with dates going about six months into the future. Another box from a different drawer said "KBr', which rang a bell somewhere in my mind, but only at the very back of it. The remaining two drawers contained tightly rolled bundles of five- and ten-pound notes and Cellophane bags with little squares of paper inside. I had no spare capacity for trying to work out what any of that other stuff was, though; my mind was racing with an awful idea it had just formed. I sat there, staring, mouth open, and I thought. I didn't look up at the jar.

I thought of that delicate face, those lightly haired arms. I tried to think of one time I had seen my father naked to the waist, but for the life of me I couldn't. The secret. It couldn't be. I shook my head, but I couldn't let go of the idea. Angus.

Agnes. I only had his word for anything that had happened. I had no idea at all how much Mrs Clamp could be trusted, no idea what sort of hold either of them might have over the other. But it couldn't be! It was just so monstrous, so appalling! I stood up quickly, letting the chair fall back and whack on the wood of the uncovered boards. I grabbed the box of tampons and the hormones, took the keys, unlocked the door and charged out, upstairs, stuffing the keys into one pocket and drawing my knife from its sheath. "Frank'll get you," I hissed to myself.

I stormed into my father's room and swtiched on the light. He was lying on the bed with his clothes on. One shoe was off; it lay on the floor under his foot, which dangled over the side of the bed. He was on his back, snoring. He stirred and flung one arm over his face, turning away from the light. I went over to him, took the arm away and slapped his face twice, hard. His head shook, and he cried out. One eye, then the other, opened. I put the knife up to his eyes, watching them focus on it with drunken imprecision. The smell of drink off him was foul.

"Frang?" he said weakly. I jabbed the knife at him, just stopping short of the bridge of his nose.

"You bastard," I spat at him. "What the hell are these?" I brandished the tampons and the hormones box in front of him with my other hand. He groaned and closed his eyes. "Tell me!" I screamed, and slapped him again, using the back of the hand holding the knife. He tried to roll away from me, across the bed under the open window, but I pulled him back from the hot, still night.

"No, Frang, no," he said, shaking his head and trying to push my hands away. I let the boxes go and got hold of him by one arm, tightly. I drew him near to me, pointed the knife at his throat.

"You're going to tell me, or by God…." I let the words hang. I let go of his arm and moved my hand down to his trousers. I slipped his belt out of the little guides round the waist. He tried to stop me in a fumbling way, but I slapped his hands back and prodded him in the throat with the knife. I undid the belt and pulled the zip down, watching him all the time, trying not to imagine what I might find, what I might not find. I undid the button at the top of the zip. I pulled his trousers open, pulled his shirt up and out. He looked at me, lying on the bed with his eyes red and gleaming, and he shook his head.

"Wha" you goin" t'do, Frangie? Am sorry, am really really sorry. Was an experimen, sall. Juss an experimen…. Don" do anything" t'me, please, Frangie…. Please…."

"You bitch, you bitch!" I said, feeling my eyes start to blur and my voice shake. I pulled his/her underpants down with a vicious tug.

Something screamed outside, in the night beyond the window. I stood staring at my father's dark-haired, large, rather greasy-looking cock and balls, and something animal, out there on the landscape of the island, screamed. My father's legs were quivering. Then came a light, orange and wavering, where no light should be, out there, over the dunes, and more screams, bleatings and baas and screams; everywhere screams.

"Jesus Christ, what's that?" my father breathed, turning a shaking head towards the window. I stood back, then went past the bottom of the bed, looking out of the window. The awful noises and the light on the far side of the dunes seemed to be coming closer. The light was in a halo over the big dune behind the house, where the Skull Grounds were; it was flickering yellow with smoke-trails in it. The noise was like that the burning dog had made, but magnified, repeated and repeated, and with another edge to it. The light grew stronger, and something came running over the top of the big dune, something burning and screaming and running down over the sea-face of the Skull Grounds dune. It was a sheep, and it was followed by more. First another two, then half a dozen animals came charging over the grass and the sand. In seconds the hillside was covered with burning sheep, their wool in flames, bleating wildly and running down the hill, lighting up the sandy grass and weeds and leaving them burning in their fiery wake.

And then I saw Eric. My father came shakily up by my side, but I ignored him and watched the skinny, dancing, leaping figure on the very top of the dune. Eric was waving a huge burning torch in one hand and an axe in the other. He was screaming, too.

"Oh, my God, no," my father said. I turned to him. He was pulling his trousers up. I pushed past him and ran to the door.

"Come on," I shouted at him. I went out, ran downstairs, not waiting to see if he was following. I could see flames through every window, hear the wails of the tortured sheep all around the house. I got to the kitchen, considered getting some water as I ran through, but decided it was pointless. I ran out through the porch and into the garden. A sheep, burning only above its back legs, nearly collided with me, running through the already blazing garden and swerving at the last second from the door with a terrified baaing, then jumping over the low fence into the front garden. I ran round the back of the house, looking for Eric.

Sheep were everywhere, fire was all about. The grass over the Skull Grounds was ablaze, flames leaped from the shed and the bushes and the plants and flowers in the garden, and dead, burning sheep lay in pools of livid fire while others ran and jumped about, moaning and howling in their guttural, broken voices. Eric was down the steps leading to the cellar. I saw the torch he had been holding, flickering flame against the wall of the house beneath the window to the downstairs toilet. He was attacking the door to the cellar with the axe.

"Eric! No!" I screamed. I started forward, then turned, grabbed the edge of the house and stuck my head round the corner to look at the open door of the porch. "Dad! Get out of the house! Dad! " I could hear the sound of splintering wood behind me. I turned and ran for Eric. I jumped over the smouldering carcass of a sheep just before the cellar steps. Eric turned round and swung the axe at me. I ducked and rolled. I landed and jumped up, ready to spring away, but he was back smashing the axe into the door again, screaming with each massive blow as though he was the door. The axe head disappeared through the wood, became stuck; he wriggled it mightily and got it out, glanced back at me and then heaved the axe at the door again. The flames from the torch threw his shadow at me; the torch lay propped against the side of the door and I could see the new paint had started burning already. I got my catapult out. Eric had the door almost down. My father still hadn't shown. Eric glanced back at me again then smashed the axe into the door. A sheep cried out behind us as I fumbled for a steelie. I could hear the crackling of fires on all sides and smell roasted meat. The metal sphere fitted into the leather and I pulled.