That cracking sound again. She froze. 'Hello?' Silence.

'Is…' She was going to hate herself for saying it: 'Is anybody there?' Might as well pop on a pair of stiletto heels and a push-up bra then sit back and wait for the axe murderer.

Silence.

Not so much as a whisper. The only sound was the pounding of her heart. This was ridiculous; just because some woman was beaten to death last week didn't mean there was someone lurking in the woods… Waiting for her…

Crack! The breath caught in her throat. There was someone out there! Fight or flight, fight or flight? FLIGHT: sprinting hell-for-leather up the barely visible path, splashing through puddles and mud. Just wanting to get back to the car park alive. Trees whipped past on either side of the track, their trunks and branches distorted by the mist into wild-killer shapes. Someone was coming after her: she could hear him, crashing through the bushes behind her, getting closer.

Past the poetry trees at a sprint, up the hill, the wet ground treacherous beneath her feet. One foot caught on a tree root and she went sprawling on the gritty mud, fire lancing across her palms and knees as the skin broke. She cried out in pain, but the bastard chasing her didn't care. There was just time to scream before a dark shape launched itself out of the mist.

And slavered all over her with a huge, wet tongue.

'Benji!' She pulled herself to her knees and swore and swore and swore while Benji danced and skittered around her, hunkering down on his forelegs and wiggling his ridiculous stumpy tail in the air. And then he stopped, stood stock still and charged off into the woods again. 'Bastard fucking dog!' Both her palms dripped with neon-red blood, the scrapes peppered with little black flecks of dirt. Her trousers were ripped open, exposing a similar story about the knees.

And her head hurt like hell. With trembling fingers she reached up and gingerly touched a tender spot above her left eyebrow, wincing. More blood. 'That's just fucking marvellous!' So much for making a good impression. She'd have to cancel, or turn up at the job interview looking like she'd been beaten up. 'You BASTARD dog!'

Benji was barking from somewhere up the track. Bloody animal had probably found something filthy to roll in.

Limping, she followed the sound into the fog-shrouded woods, all thoughts of a sinister attacker forgotten.

The lights of Alpha Two Zero cut solid blue bars through the fog. It sat in one of the Tyrebagger car parks, empty, the radio chattering away schizophrenically to itself, as WPC Buchan and PC Steve picked their way into the woods. Looking for the body.

They'd got the call about twenty minutes ago: young woman's body found battered to death, stripped naked in the woods. According to the dispatcher, the person who called it in wasn't that coherent, just kept yammering on about death and the mist and trees. And something about buying sun? WPC Buchan wasn't in the mood for this. Not after yet another fight with Robert, coming home stinking of cheap perfume and stale sweat – what was she, stupid? She stomped along the muddy path, hands in her pockets and a scowl on her face as PC Steve played Earnest Police Officer Number One, keeping up a running commentary as he swept the foggy undergrowth with a huge torch. She trailed along behind, watching him roam from bush to bush on either side of the path. He had a nice arse, even if he was a bit of a mummy's boy. She could… A faint smile drifted across her face as she thought about all the things she could do to PC Steve Jacobs. God knew it would be a damn sight more fun than the crap she'd have to go home to tonight.

They clambered up a small hill, the ground slippery beneath their feet. Just past the summit was one of those wooden post things, with a Perspex notice incorporated into it. She flipped it out, reading about how some woman called Matthews had sculpted a group of European bison resting in the primeval forest, out of chicken-wire, moss, wool, and bits of old metal. The usual heritage-slash-council-slash-art grant-crap. WPC Buchan let the sign fall back into the post and stared into the woods where a barely visible track wound its way into the trees. 'Buying sun…' Without saying another word, WPC Buchan stepped off the muddy path and followed the track into the mist.

She could hear PC Steve babbling away to himself, his voice gradually trailing off as she moved away and the fog swallowed him whole.

The ground rose beneath her feet as the track gave way to forest loam. It was like twilight here, shadows of skeletal trees lurking in the mist. Quiet as a shallow grave. And then she heard it: a faint sobbing. WPC Buchan stopped dead in her tracks. 'Hello?' She clambered to the crest of a small rise and stepped out onto an area of flat ground. 'Can you hear me?'

Still nothing.

'Oh for fuck's sake…' She pulled out her torch, even though she knew it probably wasn't going to do her the slightest bit of good. The fog would just bounce the light back, but the torch's weight felt comforting in her hand. The sort of thing you could crack someone's skull open with. Forward into the fog and WHAT THE FUCK WAS THAT?

They loomed out of the mist, cadaverous beasts, partially rotted. Grazing on the scrub-grass between the fog-shrouded trees.

It was the sculptures: bison resting in the primeval forest.

WPC Buchan might not know much about art, but she knew what gave her the fucking willies, and these things took the hairy biscuit. The sobbing was louder now, coming from somewhere near the biggest mouldering animal, the fog clearly visible through holes in its carcass. 'Hello?' She clicked on the torch and suddenly the world went white. Two unnatural green eyes flashed in the opaque mass and a low growl split the silence like a rusty knife. 'Aw shite…' The eyes came closer and she moved her free hand very slowly to the bulky utility belt at her waist, easing the tiny canister of CS gas out of its pouch. 'Nice doggy?' A face full of that stuff would have anything rolling over and playing dead.

The thing that stalked out of the fog was a spaniel, but without any of the usual happy-go-lucky exuberance. The dog's lips were curled back, exposing teeth like daggers, its muzzle smothered in gore. She pointed the CS gas at it, prayed, and sprayed. Suddenly the growling stopped. There was a moment of silence, then yelping exploded from the animal as it staggered around, trying to get away from the searing pain.

WPC Buchan didn't resist the urge to give the dog a good kick in the ribs as she picked her way past.

The sobbing was coming from behind the rotting bison. It was a woman – mid twenties from the look of her clothes – face, hands and knees sticky with plum-coloured blood.

Silly cow wasn't dead after all. It was just another stupid hoax call. WPC Buchan slipped the CS gas back into its holster. 'Are you OK?' she asked. The woman didn't answer.

Not directly. Instead she extended a grubby, bloodstained hand and pointed to one of the sculpturally rotting bison. It lay slumped on the ground, as if it had been trying to get up when death came to call. WPC Buchan turned her torch on it, illuminating the statue in all its decomposing glory.

There was something white sprawled alongside it, blending into the fog.

'Oh fuck…' Grabbing the radio off her shoulder, she called Control. They'd found the second body.

DI Steel turned up on Logan's doorstep in a suit that looked almost new. She'd even threatened her hair with a brush: it hadn't made much difference, but it was the thought that counted. 'Mr Police Hero,' she said, picking a fresh cigarette from an almost empty packet, not seeming to care that one was already smouldering away between her lined lips. 'Got some good news for you! They've found another dead tart!'

Soon they were roaring out of Aberdeen on the Inverurie road, past the airport and up the hill to the Tyrebagger Woods.