She studied his face for a moment, then half reluctantly she stood up. ‘We know where the car is.’

‘Oh?’

She laughed. A tight little laugh which hovered for a moment on the edge of hysteria. ‘It’s out on the saltings; in the middle of the water. No one could have driven it there.’

He said nothing, his gaze holding hers, then he too gave an uncomfortable laugh. ‘Well, well. Perhaps he was only used to driving chariots; a Volvo must be a bit different.’

‘You don’t seriously think – ’

‘I don’t know what I think.’ His patience snapped. ‘For Christ’s sake, what can I do from here? Just be careful. Make Paddy take the gun and watch every step of the way. We don’t know what we’re dealing with. There is someone out there who is out to kill. It seems to me it doesn’t matter much if he’s a real flesh-and-blood homicidal maniac or a ghostly one, the effect seems to be the same.’

‘So you don’t think it was Alison.’ She had turned towards the door.

‘Of course it wasn’t Alison. She wouldn’t have the strength even if she wanted to kill someone. And she had nothing to do with the car.’ He slumped back, overwhelmed by helplessness and frustration and pain. She looked down at him, hesitating for a moment longer, then silently she opened the door and slipped away.

Roger pushed a fresh cup of coffee at her across the table as she walked back into the kitchen. ‘Allie is awake. Diana and Paddy are with her.’ He gestured her towards a chair. He looked only slightly more rested than the night before; there was still an alarmingly blue tinge about his lips as Kate sat down opposite him.

‘How is she?’

He shook his head. ‘I thought I’d wait till they came down. She doesn’t want us all up there crowding into her room.’ Besides, I can’t face climbing the stairs again, not yet. The thought, though unspoken, showed clearly in his eyes.

Kate looked away, painfully aware how sick he was. ‘As soon as Paddy comes down I think we should go for a doctor.’

‘And the police have to be informed.’ He looked down into his coffee mug, stirring thoughtfully, watching the movement of the liquid, with its miniaturised reflection of the overhead lamp. ‘I know you all have some crazy idea that there is a ghost out there, Kate. Get real, as Allie would say. Ghosts do not beat large, strong men to death.’ He looked up at her at last. ‘Be careful. Please be careful -’ He broke off, and she saw his face light with a smile which hovered around his mouth for a few seconds and then died. Following his gaze, she swivelled round on her chair. Alison was standing by the staircase door. Wearing her nightshirt, her hair tumbled on her shoulders, she was staring round the room as though she had never seen it before.

‘Allie?’ Roger stood up, pushing his chair back over the floor tiles with a scraping sound which tore at the nerves. ‘Are you all right, sweetheart?’

She moved her head slightly, as though she were having difficulty focussing, and looked towards them vaguely, her body swaying from side to side. Behind her, Patrick appeared in the doorway. His face was white. ‘Allie?’ He dodged round her. ‘Allie, sit down. Sit down and I’ll get you something nice to drink.’ He gestured at Roger and Kate frantically behind his back.

They glanced at each other. The atmosphere in the room was suddenly electric. Alison took another step forward, placing one foot in front of the other with enormous care as though the floor were swaying like the deck of a ship. As she moved towards them the two cats, who had been asleep near the fire, leaped off the chair where they had been entwined and streaked across the floor. Within seconds they had both disappeared through the cat flap. Kate stared after them, puzzled. Their eyes had been wild; their hackles and tails fluffed up in terror. Frowning, she glanced back at Alison who had stopped again and it struck her suddenly that the girl looked as though she was drunk.

Roger had the same thought. ‘Alison?’ His voice was sharp. ‘What is the matter?’

‘She attacked Mum.’ Patrick murmured, his voice husky. He reached the table and slid behind it, putting it between him and his sister. ‘She’s gone mad. Oh, Dad, what’s happening?’ His face was white and strained. He looked frightened.

Roger flicked a glance at him and then looked back at his daughter. Her face was completely blank. She took another step forward, her hands out in front of her as though she were groping in the darkness.

‘Alison!’ Roger’s voice rang out loudly. ‘Answer me! What’s wrong?’ He shot a look at his son. ‘Where is Di? Is she hurt?’

Patrick shook his head. ‘Shocked. She’s coming – ’

He was interrupted by a sudden, slow laugh. The sound, he realised with a sudden shiver, came from Alison, but it was not her voice. Kate felt the hairs on the back of her neck stir as she stared at the girl.

‘No one,’ Alison spoke slowly, her voice husky. ‘No one is going to leave this house. No one is ever going to find out what happened.’ Behind her Diana appeared in the doorway. Kate heard Roger’s sharp intake of breath as he glanced at his wife. Her face was discoloured with a massive purple bruise. She slid into the room, and stayed where she was, her back to the wall, her hurt and bewilderment and fear obvious in every angle of her body.

Roger swallowed. ‘Allie, darling. I think we should have a talk. Why don’t you sit down. We’ll all have a hot drink – ’

She did not appear to have heard him. Slowly and painfully she took another step. Kate was watching her eyes. They were blank; totally blank.

‘Roger.’ She stepped closer to him, her voice barely a whisper. ‘I think she’s asleep.’

Roger glanced at her sharply then he looked back at his daughter, narrowing his eyes. ‘Dear God, I think you’re right! What do we do?’

‘Isn’t it supposed to be dangerous to wake them?’ Kate threw a pleading look towards Diana.

It was Patrick who acted. ‘If she’s asleep she can’t see us,’ he said quietly. He took a cautious step towards his sister, and then, as she failed to react he took another. Slipping round behind her, he put his hands lightly on her shoulders. ‘Come on, Allie, back to bed.’ She ignored him. ‘Allie. Come on. You must lie down – ’ He increased the pressure slightly, trying to turn her round. She tensed, then suddenly she swung round out of his grip, letting fly with a massive punch which grazed Patrick’s shoulder as he leaped out of the way.

‘All right, Alison, that is enough.’ Roger moved with surprising speed. He caught her wrists, and pulled her towards a chair. ‘Awake or asleep you are not behaving like that in this house.’ Taken by surprise she took two steps with him then she stopped and shook him off. He reeled back. Though weak with illness he was a tall man, and still fairly heavy and his daughter had flicked him away as though he were half her size. Her face was still blank; all expression completely wiped from her features.

‘She’s like a robot,’ Patrick whispered. He slipped across to his father’s side. ‘Are you OK, Dad? She hasn’t hurt you?’

Roger shook his head. They all had their eyes fixed on Alison’s face which remained impassive. Kate frowned. Was she asleep? Or was it something else? The girl stood immobile for several minutes; no one moved or spoke, then out of the corner of her eye Kate saw Diana slip from the room. Moments later she reappeared, a canvas belt in her hand. As they watched she tiptoed up behind Alison and gently she began to slide the belt around her, over her arms, obviously intending to pinion them at her sides. Alison did not react. Gently, Diana pulled the belt tighter, just above the girl’s elbows. ‘Fetch a blanket, Roger. Wrap her up tightly,’ she commanded. ‘Quickly. Before she wakes up.’

Alison stepped forward at the sound of her voice as if becoming aware of the restriction for the first time. She tried to move her arms and a look of frightened puzzlement flashed across her face to be followed immediately by a roar of rage. She turned round, lashing out with her hands and almost without effort, snapped the belt. The expression on her face was one of pure anger. She turned towards the table and reached out. Too late Kate saw the bread knife lying beside the loaf; she jumped to move it but Alison was there first and her hand was on the knife handle before Kate’s. Kate grabbed her wrist, and for a moment their eyes met across the table. Kate felt a shaft of terror stab through her; the eyes which bore into hers were not Alison’s; they were no longer expressionless; no longer asleep; they were cold, calculating and very angry.

‘Allie -’ She gasped. ‘Please.’

Alison laughed. A deep throaty laugh. Twisting her arm effortlessly beneath Kate’s grasping fingers she snatched the knife up and turning, lunged at her mother. She missed and for a moment she was off balance. Seizing his chance Patrick threw himself at her and they fell to the floor, wrestling.

‘Paddy -’ Diana’s scream rang across the room as the blade caught his forearm and a splash of blood flew across the rush matting, but he did not let go. They fought on furiously, Patrick kicking and struggling as Alison began surely and steadily to overpower him. ‘Roger, do something!’ Forgetting her husband’s weakness Diana screamed again but it was Kate who snatched up the folded tablecloth from the dresser and flung it over Alison’s head. At the same moment Patrick wriggled free of his sister’s arm lock and put his foot on her wrist, pinning it to the floor while he snatched the knife from her. It was only then that they realised that Greg was in the room, hobbling on a walking stick, his face white with pain.

‘Here.’ He handed something to his mother. ‘Quickly. It’s Dad’s sedative.’ Her hands shaking visibly, Diana opened the box he had given her and took out a syringe. She glanced at Roger, then filling it she approached her writhing daughter and, pulling the night shirt up, planted the needle in the girl’s buttock. Alison let out a scream of rage, only half muffled by the tablecloth Kate was holding round her head. It was followed by a stream of abuse which only very slowly subsided into silence. It was several minutes before her clenched fists relaxed and she slumped to the floor. Cautiously Kate removed the tablecloth and looked down. Alison’s face, flushed from the struggle was relaxed at last; she was breathing quickly and lightly, her hair spread across the floor. Slowly Patrick stooped and pulled his sister’s nightshirt down to cover her bottom, then he turned and picking up a drying up cloth from the draining board he staunched the blood flowing from his arm.