However, squinting closely, she can just see a twisted pattern, almost like a plait. The piece in her hand is barely fifteen centimetres long but she can imagine it as a full half circle, imagine it round the neck of some savage beauty. Or round the neck of a child, a sacrificial victim?

She remembers Nelson's bitter disappointment when he learnt that the bones were not those of Lucy Downey.

What must it feel like to have those deaths, those ghosts, forever on your mind? Ruth knows that for him the Iron Age bones are an annoyance, an irrelevancy, but for her they are as real as the five-year-old girl who went missing all those years ago. Why were the bones left on the edges of the marsh? Was she (from their size, Ruth thinks the bones are female but she cannot be sure) left for dead, sinking in the treacherous mud? Or was she killed somewhere else and buried at the start of the marshland, to mark the beginning of the sacred landscape?

When her pasta is cooked Ruth eats it at the table by the window, Erik's book The Shivering Sand propped up in front of her. The title is from The Moonstone by Wilkie Collins and Ruth turns again to the first page where Erik quotes Collins' description of the sands: The last of the evening light was fading away; and over all the desolate place there hung a still and awful calm.

The heave of the main ocean on the great sandbank out in the bay, was a heave that made no sound. The inner sea lay lost and dim, without a breath of wind to stir it. Patches of nasty ooze floated, yellow-white on the dead surface of the water. Scum and slime shone faintly in certain places, where the last of the light still caught them on the two great spits of rock jutting out, north and south, into the sea. It was now the time of the turn of the tide: and even as I stood there waiting, the broad brown face of the quicksand began to dimple and quiver – the only moving thing in all the horrid place.