Dead things had always been special to him. Their delicate coldness. The feel of the skin. The ripe, sweet smell as they decayed. As they returned to God.

The thing in his hands hadn't been dead for long.

Just a few hours ago it was full of life.

It was happy.

It was dirty and flawed and filthy…

But now it was pure.

With gentle hands he placed it reverently on top of the pile with the others. Everything in here was alive once, was busy and noisy and dirty and flawed and filthy. But now they were with God. Now they were at peace.

He closed his eyes and breathed deeply, bathing in the smells. Some fresh, some corpulent. All lovely. This was what it must smell like to be God, he thought, smiling down at his collection. This was what it must smell like to be in heaven. Surrounded by the dead.

A smile spread across his lips like fire in a burning building. He really should take his medication, but not now. Not yet.

Not when there were so many dead things to enjoy.

It was pissing down outside. The rain battered against the blue plastic SOC tent's walls and roof, clattering in the confined space, fighting against the constant drone of the portable generators, making conversation impossible. Not that anyone was feeling particularly chatty at a quarter past midnight on a Monday morning.

Not with David Reid lying there. On the freezing ground.

At one end of the lopsided tent a four foot stretch of ditch was cordoned off with blue police tape. Dark, greasy water glinted in the spotlights. The rest of the tent was taken up by riverbank, the winter-yellow grass beaten flat and muddy underfoot.

It was crowded in here. There were four constables from Aberdeen's Identification Bureau, wearing white paper boiler suits: two covering everything with fingerprint powder and sticky tape; one taking photographs; and the fourth videoing the crime scene for posterity. Add to that one decidedly green-looking PC, the duty doctor, a detective sergeant who'd seen better days, and the guest of honour. Little David Brookline Reid. Three months short of his fourth birthday.

They'd had to drag him out of the cold, water-filled ditch before death could be declared. Not that there was any doubt about it. The poor little sod had been dead for a long time. He was lying on his back on a square of blue plastic, exposed for all the world to see, an X-Men T-shirt pulled up around his shoulders. He wasn't wearing anything else.

The camera flashed again, burning away all detail and colour, leaving an imprint on the retina that refused to go away.

Standing in the corner Detective Sergeant Logan McRae closed his eyes and tried to think what he was going to tell little David Reid's mother. Her son had been missing for three months. Three months of not knowing. Three months of hoping her child would turn up safe and sound. While all the time he'd been lying dead in a ditch.

Logan ran a hand over his tired face, feeling the stubble scritch beneath his fingers. Christ, he could kill for a cigarette. He wasn't even supposed to be here!

He pulled out his watch and groaned, his breath coming out in a plume of white fog. Fourteen hours since he'd reported for duty yesterday morning. So much for easing back into the swing of things.

A frigid gust of wind whipped into the tent, and Logan looked up to see a sodden figure hurry in out of the rain. The pathologist had arrived.

Dr Isobel MacAlister: thirty-three, bobbed hair, brunette, five foot four. Makes little mewing noises when the inside of her thigh is nibbled. She was dressed immaculately in a fitted grey trouser suit and black overcoat, the effect only slightly spoiled by a huge pair of Wellington boots flapping about up to her knees.

She cast a professional glance around the crowded tent, freezing when her eyes locked onto Logan. An uncertain smile flickered onto her face before sliding away. Not surprising considering how much of a state he must look. Unshaven, bags under the eyes, dark brown hair which was wild, unkempt and frizzy from the rain.

Isobel opened her mouth and closed it again.

Rain hammered on the tent's roof, the camera clacked and whined as the flash came back up to speed, the generators growled. But the silence was deafening.

It was the duty doctor who broke the spell. 'Aw shite!' He stood on one leg, shaking a waterlogged shoe.

Isobel put on her professional face.

'Has death been declared?' she asked, shouting to be heard over the din.

Logan sighed. The moment had passed.

The duty doctor stifled a yawn and pointed at the small, bloated corpse in the middle of the tent. 'Aye, he's dead all right.' He stuffed his hands deep in his pockets and gave a loud sniff. 'If y'want my opinion: he's been dead for a good wee whilie. Least two months.'

Isobel nodded and placed her medical bag on the groundsheet next to the body. 'You're probably right,' she said, squatting down and peering at the dead child.

The doctor rocked back and forth for a while, squelching in the mud, as Isobel snapped on a pair of latex gloves and started unpacking her instruments. 'Aye, well,' he said, 'give us a shout if you need anything, OK?'

Isobel promised she would and the duty doctor gave a small bow and excused himself, squeezing out past Logan into the rain-soaked night.

Logan looked down on the top of Isobel's head, thinking of all the things he'd planned to say the first time he saw her again. To make it all right again. To fix what fell apart the day Angus Robertson got sent down for thirty to life. But whenever Logan pictured this moment there wasn't a murdered three-year-old lying on the ground between them. It kind of put a damper on things.

So instead he said, 'Can you give me a time of death?'

She looked up from the decaying body and blushed slightly. 'Doc Wilson wasn't far off,' she said, not meeting his eyes. 'Two, maybe three months. I'll know better when I do the post mortem. You got an ID?'

'David Reid. He's three.' Logan sighed. 'Been on the Misper list since August.'

'Poor wee sod.' Isobel pulled a slim headset out of her bag, slipped it over her hair and checked that the microphone was working. She inserted a fresh tape into her dictaphone and began her examination of little David Reid. Half past one in the morning and there was still no sign of the rain letting up. DS Logan McRae stood in the lee of a twisted oak, using the tree as a windbreak, and watched as the photographer's flash filled the SOC tent with staccato lightning. Every time the flash went off, the figures within hurled silhouettes against the blue plastic like a grizzly shadow play.

Four high-powered spotlights sizzled in the torrential downpour, bathing the area around the tent with harsh white light while the generators chugged away in a haze of blue diesel smoke. Cold rain hissing on the hot metal. Outside that circle of light it was pitch black.

Two of the spotlights were trained on the ditch where it emerged from beneath the SOC tent. The late November rains had filled the ditch to overflowing and grim-faced police divers, dressed in dark-blue neoprene dry-suits, groped around in the waist-high water. A pair of bodies from the Identification Bureau were trying to swear a second tent into place over the divers, fighting a losing battle against the wind and rain as they tried to preserve any forensic evidence from the storm.

Less than eight feet away, the River Don surged past, silent, swollen and dark. Flecks of light danced across its surface: the spotlights reflecting back off the black water, their shapes shattering and reforming beneath the torrential rain. If there was one thing Aberdeen did properly, it was rain.