CHAPTER 30

Holding Lucy's hand tightly, Ruth runs. She doesn't know where she is going, she doesn't give a thought to the tide or the marshes, she hardly notices the wind and the rain, all she knows is that they are running for their lives. A murderer is after them, a man who has killed once before and who is intent on silencing them. Beside her, Lucy runs surprisingly well, hardly making a sound. Ruth hangs grimly onto her hand. She mustn't let Lucy go. Alone, in the dark, on the tidal marsh, she would have no chance at all.

Ruth can hear David behind them. He is wading through the stream they have just crossed. She must change direction, head for home. But where is home? She makes a random left turn and finds herself facing a pool of water. She runs on and finds the ground getting softer and softer. Oh God, she must be on the mudflats. She has a sudden vision of Peter, ten years ago, calling for help as the tide advanced. Erik had saved him but he is not going to save Ruth.

And then she hears something. Almost as if Erik's voice is coming back to her, over the years. She stops, listening.

It sounds almost like 'Police'. She must be hallucinating.

But it was a mistake to stop. With horrifying suddenness, David's face suddenly looms out of the dark. Ruth screams and Lucy breaks free.

'Lucy!' yells Ruth.

David lunges forward, grabbing Ruth's foot. She kicks out. He falls back. Ruth takes to her heels again; she must find Lucy before David does.

But David is right behind her. She can hear his ragged breathing; hear the splashing as he wades through the pool. Frantically, Ruth turns and finds herself scrambling up a sandy slope. A sand dune. She must be right near the sea but she barely has time to think this when she is falling down the other side of the dune and landing in water. Salt water. Looking ahead, she can see nothingness. Only the ink-black sea, flecked with white foam, coming relentlessly towards her. She turns and wades inland, along a narrow channel of water. Where's Lucy? She must find Lucy.

Ahead of her, she can see a square dark shape in the water. She heads for it and sees what it is. A Second World War pill box, a small brick structure about a metre high.

They are dotted all over the marshes. For want of anything better to do, she climbs on top of the box. If she jumps, she can reach the higher ground, where she should be safe from the tide. She jumps and lands heavily on the opposite bank. A brief thrill of elation runs through her. She has done it! Super Ruth!

But then the elation vanishes. Standing over her, knife in hand, is David.

Nelson runs across the salt marsh. He hardly notices that he falls many times, staggering in and out of the water.

Behind him he can hear Cathbad shouting something about the tide but he ignores him. Someone is screaming.

Ruth is in danger.

'Police!' he yells. 'Freeze!'

He hasn't even got a gun, what's he going to do when he gets there? He doesn't think about that, just runs doggedly on.

And then he sees the solid shape of the hide, looming up out of the featureless darkness. He runs towards it.

The hide is deserted, eerie in the moonlight. Nelson climbs the steps and looks down into the dark hole left by the trapdoor. Thank God he took the torch from Cathbad.

Its bright beam illuminates the underground room.

'Jesus,' breathes Nelson.

'Sorry Ruth,' says David, again sounding quite normal, the shy helpful neighbour who had looked after her cat and to whom (Oh God!) she had given her mobile phone number.

'David…' Ruth croaks.

'I have to kill you,' explains David, 'now you know about Lucy.'

'Why did you do it?' asks Ruth. She genuinely wants to know the truth, even though she knows it might be the last thing she hears.

'Why?' asks David, surprised. 'For company, of course.'

He moves towards her, holding out the knife. Ruth backs away, wondering what her chances are. They are standing on a raised bank, behind David is the pool she passed earlier. She has no idea how deep it is. Even if she manages to get past him, she can hardly swim across the water in the dark. Behind her are the sand dunes and the sea crashing relentlessly forwards. She is exhausted and overweight; she knows David would catch her easily. She opens her mouth to say something. To beg for mercy?

She doesn't know. But, then, another noise fills the night.

Three echoing calls, harsh and even. It is the sound that she heard earlier, beside the hide. David looks at Ruth, his face is transfixed.

'Did you hear that?' he whispers.

Without waiting for an answer, he turns his back and starts walking away from her, towards the sound. It comes again. Calling, calling across the black marshes. Is it the voice of a dead child? The will o'the wisps? At this moment, Ruth will believe anything. She too starts to move towards the sound.

What happens next is like a dream. Or a nightmare.

Moving as if hypnotised, David walks straight into the pool. He is waist deep but does not even seem to notice.

Ruth sees his yellow jacket moving steadily through the inky water. Then, the clouds move and Ruth sees a figure on the opposite bank. A figure wearing a dark jacket that comes to below its knees. Lucy. There is something in her stance, something poised and purposeful, that is almost terrifying. Suddenly Ruth has no doubt that it is Lucy who is making the strange, unearthly call.

David, though, is beyond thought. He walks on through the water, head up, pulled as if on invisible strings. And then, so suddenly that no-one has time to cry out, a huge white-edged wave comes crashing over the sandbank and into the pool. David loses his balance and disappears under the water. Another wave follows, turning the pool into a cauldron of foamy water. Ruth feels spray on her face and shuts her eyes. When she opens them again, the pool is still and David has vanished.

Now Ruth screams but she knows no-one can hear her.

She knows too that there is nothing anyone can do for David and is surprised at the strength of her impulse to save him. It seems that even the death of a murderer can provoke pity.

Another figure appears on the opposite bank. A tall, thick-set figure. Nelson. He is shouting something but Ruth can't make out the words. She starts to make her way towards him, around the edge of the pool. As she does so, the sky is filled with a sound like the beating of enormous wings. A police helicopter appears overhead, its rotors churning up the black waters. It circles the pool and then heads out to sea. The water is still once more.

On hands and knees, Ruth crawls along the shingle bank on the south side of the pool. It is further than it looks and she is beyond exhausted. The sound of the helicopter fades away and now she can hear human voices and, in the distance, dogs barking.

By the time she has reached the far bank, the police dogs have arrived. Actual bloodhounds, straining at their leashes and uttering low, booming barks that seem to come from another century. Ruth reaches Nelson just as he is looking, with dawning wonder, into the face of the girl next to him.

'Nelson,' says Ruth, 'meet Lucy Downey.'

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