'All suspects could be in possession of baseball bats or similar weapons. Approach with caution.'

Now he could almost taste the coffee. He could feel the crunch of the toasted teacake and the clinging softness of the melted cheese. Saliva began to seep on to his tongue. Cooper pulled back his glove to look at his watch. Plenty of time.

While his nose was pressed close to the window, a hand came up and wiped away some of the condensation. A woman's face appeared, her eyes wide with outrage. She mouthed an obscenity and raised two fingers that poked from a blue woollen mitten. Cooper pulled away. There would be no toasties this morning, and no coffee.

'Control, I need a car outside the Starlight Café in Hollowgate.'

'With you in two minutes, DC Cooper … Is it still dark out there?'

'It's an hour before dawn,' said Cooper. 'What do you think?'

* * * *

It was the ice and the scouring wind that created the worst of Marie Tennent's delusions. They were like daggers thrust into her brain, plunged in so deeply that their edges scraped together in the middle of her skull, filling her head with noise.

For the last hour before she died, Marie believed she could hear music wailing in the wind, the hissing of wheels on an icy road, and the muttering of voices deep in the snow. Her mind struggled to interpret the sounds, to make sense of what was happening to her. But the music was meaningless and the voices distorted, like the babbling of a badly tuned radio when its batteries were almost dead.

Marie lay amid the smells of bruised snow and damp air, with the taste of her own blood in her mouth and her body a bewildering pattern of cold spots and numbness and pain. Her arms and legs were burning where the snow had melted into her clothes and frozen again. And the ache in her head had flowered into a savage, unbearable agony.

It was because of the pain that Marie knew, in a lucid spell, that the sounds she could hear were caused by the tiny bones of her inner ear shrinking and twisting as they froze. They were grating against each other as they contracted, creating an internal whisper and mumble, a parody of sound that mocked her slow withdrawal from the boundaries of reality. It was a disturbing and inarticulate farewell, a last baffling message from the world. It was the only accompaniment to her dying.

The sun had dropped over the edge of Irontongue Hill, so that the snow-covered moor was in shadow, and the temperature was dropping fast. Marie felt the faint, cold kiss of snowflakes on her face. Yet the top of the hill was still touched by the last of the sun, and the snow on the rocks was turned blue by the light. Irontongue itself was hidden from her, its fissured shaft of dark gritstone poking southwards over the valley. But she caught a glint of water to the north, where Blackbrook Reservoir lay in a hollow of the moors.