Steve Cowling stood in the doorway in his white gown, beaming with his perfect white teeth. A tall man in his mid-fifties, with a ramrod-straight military bearing, immaculate hair becoming increasingly grey every time Roy saw him, he exuded charm and confidence in equal measure, combined always with a certain boyish enthusiasm, as if teeth really were the most exciting thing in the world.

‘Come in, old chap!’

Grace gave an apologetic nod to the elderly lady, who looked distinctly miffed, and followed the dentist in to his bright, airy torture chamber.

While, like himself, Steve Cowling grew a little older with each visit, the dentist had an endless succession of assistants who grew younger and more attractive. The latest, a leggy brunette in her early twenties, holding a buff envelope, smiled at him, then removed a clutch of negatives and handed them to Cowling with a flirty glance.

He picked up the alginate cast Roy had given him twenty minutes earlier. ‘Right, Roy. This is really quite interesting. The first thing I have to say is that it is definitely not Sandy.’

‘It’s not?’ he echoed, a little flatly.

‘Absolutely not.’ Cowling pointed at the negatives. ‘Those are Sandy’s – there’s no comparison at all. But the cast provides quite a lot of information that may be helpful.’ He gave Grace a bright smile.

‘Good.’

‘This woman has had implants, which would have been quite expensive when they were done. Screw-type titanium – made by a Swiss company, Straumann. They’re basically a hollow cylinder put over a root, which then grows into them and makes a permanent fixing.’

Grace felt a conflicting surge of emotions as he listened, trying to concentrate but finding it hard suddenly.

‘What is interesting, old boy, is that we can put a rough date on these – which corresponds to an estimate of how long ago this woman died. They started going out of fashion about fifteen years ago. She’s had some other quite costly work done, some restorations and bridge work. If she’s from this area, then I would say there are only about five or six dentists who could have done this work. A good place to start would be Chris Gebbie, who practises in Lewes. I’ll write down the others for you as well. And it means that she’d have been reasonably well off.’

Grace listened, but his thoughts were elsewhere. If this skeleton had been Sandy, however grim, it would have brought some kind of closure. But now the agony of uncertainty continued.

He didn’t know whether he felt disappointed or relieved.

The stench that erupted from the car’s boot made everyone on the river bank gag. It was like a blocked drain that had suddenly been cleared and months – maybe years – of trapped gases from decomposition were freed into the air, all at once.

Lisa backed away in shock, pinching her nose shut with her fingers, and closed her eyes for a moment. The searing midday sun and the relentless flies somehow made things even worse. When she opened her eyes and took in a gulp of air just through her mouth, the smell was still as bad. She was really struggling not to vomit.

MJ didn’t look like he was finding this any easier, but both of them were doing better than the panicky cop, who had turned away from the car and was now on his knees, actually throwing up. Holding her breath, ignoring the cautionary pull on her hand from MJ, Lisa took a few steps towards the rear of the car and peered in.

And wished she hadn’t. The ground beneath her feet suddenly felt unsteady. She gripped MJ’s hand tightly.

She saw what looked at first like a shop-window dummy that had melted in a fire, before realizing that it was the body of a woman. She was filling most of the deep boot space, lying partially submerged in slimy, glistening black water that was steadily draining away. Her shoulder-length fair hair was splayed out like matted weed. Her breasts had a soapy colour and texture, and there were large black blotches covering much of her skin.

‘Has she been burned?’ MJ, who was curious about everything, asked the shorter cop.

‘That’s – no – no, mate, that’s not burning. Skin slippage.’

Lisa looked at the cadaver’s face, but it was bloated and shapeless, like the half-melted head of a snowman. Her pubic hair was intact, a thick brown triangle looking so fresh it seemed unreal, as if someone had just stuck it on as a grotesque joke. She felt almost guilty looking at it. Guilty being here, staring at this body, as if death was a private thing and she was intruding.

But she could not tear her eyes away. The same questions kept going round and round in her mind. What happened to you, you poor thing? Who did this to you?

Eventually, the panicky cop recovered his composure and moved them back abruptly, saying this was a crime scene and he would need to tape it off.

They edged back several paces, unable to avert their eyes, as if they were watching some episode from CSI in real time. Shocked, gripped and numb – but curious as the circus grew. MJ produced some water and baseball caps from the car and Lisa drank gratefully, then pulled a cap on to keep the searing heat off her head.

A white crime scene van arrived first. Two men in slacks and T-shirts climbed out and began pulling on white protective suits. Then a smaller, blue van from which a crime scene photographer emerged. A short while later, a blue VW Golf arrived and a young woman climbed out. She was in her twenties, in jeans and a white blouse, with a frizz of fair hair, and stood for some moments observing the scene. She was holding a notebook in one hand and a small tape recorder. Then she walked over to MJ and Lisa.

‘You’re the ones who found the car?’ She had a pleasant but brisk voice.

Lisa pointed at MJ. ‘He did.’

‘I’m Angela Parks,’ she said. ‘From the Age. Could you tell me what happened?’

A dusty gold Holden was now pulling up. As MJ told his story, Lisa watched two men in white shirts and ties climb out. One was stocky, with a serious, boyish face, while the other looked like a bruiser: tall, powerfully built – if a little overweight – with a bald head and a narrow ginger moustache. He had an expression like thunder – probably from being called out on a weekend, Lisa thought, though she rapidly discovered otherwise.

‘You bloody idiot!’ he yelled at the panicky cop, by way of a greeting, standing some distance back from the crime scene tape. ‘What a fuck-up! Didn’t yer ever do any basic fucking training? What have you done to my crime scene? You’ve not just contaminated it, you’ve fucking desecrated it! Who the fuck told you to move the car out of the water?’

The panicky cop seemed lost for words for some moments. ‘Yeah, well, sorry about that, sir. Guess we screwed up a bit.’

‘You’re fucking standing in the middle of it now!’

The stocky one walked over to Lisa and MJ and nodded at the reporter. ‘How you doing, Angela?’

‘Yeah, OK. Nice to see you, Detective Sergeant Burg,’ she said.

Then his colleague, the bruiser, walked across in big sturdy strides, as if he owned the river bank and all around it. He gave a cursory nod to the journalist and then addressed Lisa and MJ. ‘Detective Senior Sergeant George Fletcher,’ he said. His manner was professional and surprisingly gentle. ‘You the couple that found the car?’

MJ nodded. ‘Yep.’

‘I’m going to need a statement from you both. Would you mind coming to Geelong Police Station?’

MJ looked at Lisa, then at the detective. ‘You mean now?’

‘Some time today.’

‘Of course. But I don’t think there’s a lot we can tell you.’

‘Thank you, but I’ll be the judge of that. My sergeant will take your names and addresses and contact phone numbers before we leave.’