The street was dark as they entered the boarded-up building: scruffy wee shites in their tatty jeans and hooded tops. Three men and two women, nearly identical with their long hair, pierced ears, pierced noses and pierced God knew what else.

Everything about them screamed 'Kill Me!'

He smiled. They would be screaming soon enough.

The squat was halfway down a terrace of abandoned two storey buildings – dirty granite walls barely lit by the dull streetlights, windows covered with thick plywood. Except for one on the upper floor, where a thin, sick-looking light oozed out through the dirty glass, accompanied by thumping dance music. The rest of the street was deserted, abandoned, condemned like its inhabitants, not a soul to be seen. No one about to watch him work.

Half past eleven and the music got even louder; a pounding rhythm that would easily cover any noise he made. He worked his way around the doorframe, twisting the screwdriver in time with the beat, then stepped back to admire his handiwork – three-inch galvanized woodscrews all the way round the door, holding it solid against the frame, making sure it stayed irrevocably shut. A grin split his face. This would be good. This would be the best one yet.

He slipped the screwdriver back into his pocket, pausing for a moment to stroke the cold, hard shaft. He was hard too, the front of his trousers bulging with barely concealed joy. He always loved this bit, just before the fire started, when everything was in place, when there was no way for them to escape. When death was on its way.

Quietly he pulled three glass bottles and a green plastic petrol can from the holdall at his feet. He spent a happy minute unscrewing the bottles' caps, filling them with petrol and popping the torn rag fuses in place. Then it was back to the screwed-shut front door. Lever open the letter box.

Empty the petrol can through the slot, listening to the liquid splash on the bare, wooden floorboards, just audible through the pounding music. A trickle seeped out under the door, dribbling down the front step to form a little pool of hydrocarbons.

Perfection.

He closed his eyes, said a little prayer, and dropped a lit match into the puddle at his feet. Whooooomp. Blue flame fringed with yellow raced under the door, into the house.

Pause, two, three, four: just long enough for the blaze to get going. Throw a half brick in through the upstairs window, shattering the glass, letting the throbbing music out. Startled swearing from inside. And then the first petrol bomb went in. It hit the floor and exploded, showering the room with burning fuel. The swearing became screaming. He grinned and hurled the remaining bottles into the blaze.

Then it was back to the other side of the road, to lurk in the shadows and watch them burn. Biting his lip, he pulled his erection free. If he was quick he could come and go before anyone arrived.

He needn't have hurried. It was fifteen minutes before anyone raised the alarm and another twelve before the fire brigade turned up.

By then everyone was dead.

Rosie Williams died the way she'd lived: ugly. Lying on her back in the cobbled alley, staring up at the orange-grey night sky, the drizzle making her skin sparkle, gently washing the dark red blood from her face. Naked as the day she was born.

PC Jacobs and WPC Buchan were first on the scene. Jacobs nervously shifting from foot to foot on the slick cobbled road, Buchan just swearing. 'Bastard.' She stared down at the pale, broken body. 'So much for a quiet shift!' Dead bodies meant paperwork. A small smile crept onto her face. Dead bodies also meant overtime and Christ knew she could do with some of that.

'I'll call for backup?' PC Steve Jacobs fumbled for his radio and called Control, letting them know the anonymous tip-off was for real.

'Hud oan a mintie,' said Control in broad Aberdonian. There was a pause filled with static and then, 'You're goin' ta have ta hold the fort oan yer own for a bit. Everyone's off at this bloody fire. I'll get ye a DI soon as one 'comes available.'

'What?' Buchan grabbed the radio off Jacobs, even though it was still attached to his shoulder, dragging him off balance. 'What do you mean, "as soon as one becomes a-bloody-vailable"? This is murder! Not some sodding fire!

How the hell does a fire take precedence over-'

The voice of Control cut her off. 'Listen up,' it said, 7 dinna care what problems you 'we got at home: you bloody well leave them there. You 'II do as you 're damn well told and secure the crime scene till I can get a DI to you. And if it takes all bloody night that's how long you wait: understood?'

Buchan went furious scarlet, before spitting out the words, 'Yes, Sergeant.'

'Right.' And the radio went dead.

Buchan started swearing again. How the hell were they supposed to protect a crime scene with no IB team? It was raining for God's sake; all the forensic evidence would be getting washed away! And where the hell were CID? This was supposed to be a murder enquiry – they didn't even have an SIO!

She grabbed PC Jacobs. 'You want a job?'

He frowned, suspicious. 'What kind of job?'

'We need a Senior Investigating Officer. Your "mate" lives around here doesn't he? Mr Police Bloody Hero?'

Jacobs admitted that yes, he did.

'Right, go wake the bastard up. Let him deal with it.'

WPC Watson had the nastiest collection of bras and pants that Logan had ever seen. All of her underwear looked like it had been designed by World War One zeppelin manufacturers on an off day – uniform baggy-grey. Not that he got to see a lot of Jackie's underwear these days, but for a brief spell their shifts were in synch. Logan smiled sleepily and rolled over, the light from the hallway spilling through the open door, illuminating the rumpled bed.

He squinted at the alarm clock: almost two. Still another five hours before he had to report for work and yet another bollocking. Five whole hours.

Click, the light in the hall died. A soft silhouette filled the doorway, having a bit of a scratch as it scuffed its way back into bed. WPC Jackie Watson wrapped her unbroken arm around Logan's chest and settled her head against his shoulder, unfortunately sticking the curly ends of her hair up his nose and into his mouth. Discreetly spitting them out, he kissed the top of her head, feeling the cool length of her body pressed against him. She ran a finger over the inch long trails of scar tissue that crisscrossed his torso and Logan thought: maybe five hours wasn't so long after all…

Things were just getting interesting when the doorbell went.

'Damn it,' mumbled Logan.

'Ignore it, probably just drunks.' The doorbell rang again, more insistent this time. As if the sod on the other end was trying to drill his way into the building with his thumb.

'Bugger off!' Logan shouted into the darkness, causing Jackie to dissolve into a fit of the giggles, but it didn't deter the phantom ringer. Then Logan's mobile phone joined in the noisy pre-dawn chorus. 'Oh for God's sake!' He rolled off, provoking a groan of displeasure, and grabbed the phone from his bedside cabinet. 'WHAT?'

'Hello, sir? DS McRae?' PC Steve Jacobs: the Fabled Naked Swordsman of Old Aberdeen.

Logan let his head slump, face first, into the pillow, still holding the phone to his ear. 'What can I do for you, Constable?' he asked, thinking that this had better be damned important if it was going to distract him from a naked WPC Watson.

'Er… sir… We've kinda got a body… an-'

'I'm not on duty.'