Viper

'Ciao, Jack. Sylvia, she is down at the other scene.' They shook hands and Pietro motioned them forwards. 'Sorry we have to walk, but the forensic teams they are still examining the grass for vehicle marks.'

'No problem, I need the exercise. Sylvia said the polizia were first on the scene. Is there a jurisdiction problem?'

'No. The parents of the teenagers they called the polizia, but we cooperate very well and they say we can run the case.'

They trudged briskly into a gathering wind and were slightly breathless by the time they reached the crime scene.

The pit itself resembled a crater that had been made by the impact of a giant meteorite. Inside it, everyone wore white Tyvek coveralls with protective masks and gloves. They looked like spacemen. Jack paused to take it all in. The excavation was deep at the centre, maybe as much as two metres. The pit was more rectangle than square. In its centre was a patch of heavily blackened ground, with mounds of burned rubbish and a white forensic tent.

'What was this used for?'

Pietro shrugged. 'I don't know. Looks like a building excavation. I think a house was going to be made. My uncle was a builder and he had digs like this.'

'But there's crap everywhere.' Jack pointed to old, burned cans and shrivelled plastic lying between the duckboards that the forensic teams had put down.

'They've been burning trash here. We have a problem with garbage in Naples. The authorities don't collect properly, so many people with land make money burning garbage, or burying it.'

The top of the pit was marked off with crime-scene tape and guarded by officers logging in anyone with authority to access the area. Pietro pointed to it. 'Sylvia is down there, with the ME. You want to join them?'

'In a minute.' Jack's gaze moved on to another tented area. It was obviously where the car was being examined. Where the young couple had been murdered.

'That shooting looks routine, they are almost done there.' Pietro pointed to the middle of the pit. 'The other site is – how you say? Far more complex.'

In Jack's mind there was no such thing as a routine shooting. Every killing had its own peculiarities – the signature marks of the murderer. He walked across the boards to the tent and came out at the driver's side of the car. The vehicle's metalwork had already been dusted with fingerprint powder. 'Pietro, can you talk me through what went on here?'

'Sure. The boyfriend was in the driver's seat when he was shot. We know this from the blood and angle of the bullet. The girl, she was in the back and -'

'Why?'

'Scusi?'

'Why was the boyfriend in the front while she was in the back?'

Pietro smiled. 'He was naked except for his socks. She – she was naked too. So I think he had been in the back, kneeling or sitting. It is possible that they heard or saw something that frightened them, so he got in the driver's seat and drove off.'

'Towards the pit?'

'We think so.'

'So he drove towards where the other woman was killed?'

'Si.'

Jack puzzled it out. The couple must have been killed after the woman in the pit. Perhaps they heard her scream and thought they could help. Poor kids. They obviously hadn't recognized the true nature of what was happening or they'd have driven in the opposite direction. Unless, of course, it had been so dark that they hadn't really known in which direction they were travelling. Or, so close that they'd had to drive this way to be able to turn the vehicle around.

Pietro seemed to read his thoughts. 'They were parked not far from here. If you look where I'm pointing, there are tyre marks over there. Seems they skidded when they tried to turn round and ended up here.'

'And we think here is where they were shot?'

'Si.'

'Angle of gunfire?'

Pietro made a pistol out of two fingers and crouched at window level. 'About this height. Scusi…' he shuffled Jack to one side, 'and about from here.'

Jack's mind turned to the killer. He would have been in the pit with the burning girl. After she screamed, he would have shot her. Then no doubt he heard the car start up and thought he was going to be discovered. He'd have rushed out of the pit, seen the headlights of the vehicle, then moved in to wipe out any witnesses. Jack pointed to the pit. 'At the edge – the one nearest to where we are now – you may find finger indentations, trace evidence, footprints, marks from the front of the killer's footwear. There'll be elbow marks on the clay banking – all that evidence could have been left as he climbed out in a hurry.'

'We know,' said Pietro. 'We are not the FBI, but these things we know to look for.'

'Sorry,' said Jack. 'I was just thinking out loud.' Both bodies had just been removed from the scene. He'd want to see the photographs later. Hopefully they'd been stripped of the few remaining clothes before being bagged. The reason was simple. Inside the zipped bag, they would bleed through their wounds as soon as they were moved. By the time they got to the morgue, any clothes left on them would be soaked in blood. Any fibre, skin or hair evidence left by the offender would be lost in the blood flow.

'The dead teenagers. There's no way you're looking at them for the murder in the pit?' Jack couldn't see how, but he wanted to check anyway.

'No, we are not thinking so. The families are decent families. It looks like the boy and the girl they were just out having some fun.'

'May I look inside?'

Pietro spoke to a technician who was squatting in a tiny protected space in the vehicle, and he climbed out. Jack asked for gloves. He snapped them on and was careful not to brush against anything as he leaned inside.

The vehicle stank of blood, forensic swabs and a new pine air freshener that was still hanging from the cigarette lighter beneath the plastic dashboard. 'The girl was in the back, her head on the right side, behind the passenger seat?'

'Si, that is right.'

Jack ran sequences through his head. He shoots the boyfriend, blowing out the window, then opens the door and leans into the vehicle. The girl's frightened so she moves as far away as she can from him. It's a two-door, so there's no exit from the back. He has to have got his face inside to see her, maybe even talk to her. Then he shoots her. 'Have Ballistics already been all over the vehicle?'

Pietro nodded. 'Been and gone. That's what you say, yes?'

Jack smiled. 'Yep, that's what we say. There'll be gunshot residue all over this car. Massive amounts of it. And, of course, all over our killer's hand and clothing.'

'They have taken the GSR tests.'

'Good. You find the cartridges?'

'Two.'

'I guess one was outside, near the back of the front tyre, that would be the first shot. The other, the second – well, the second one would be inside, in the footwell beneath the driver's seat?'

Pietro looked surprised. 'How did you know?'

'All handguns – well, at least, all the handguns I've ever heard of – eject cartridges only to the right. So given where the bodies were, the discovery sites are pretty obvious.'

Pietro made a mental note to remember this.

Jack's head was once more inside the car. His mind was back at the moment of the murders. 'Our shooter will have pushed the dead boyfriend out of the way and the girl would have been screaming or pleading for her life. If the girl screamed, then he probably shot her immediately. If she pleaded for her life, then he would have dragged it out. Enjoyed it more. A man who likes to see women burn to death doesn't like to kill quickly, unless he has to. So, let's guess that he tried to calm her down. He would have made her believe she could live – he'd have liked that – then he'd have killed her.'