Clumps of black organic matter, like the residues of a partly digested meal, covered my fingers with a faint ruddiness. I raised the fragments to my nose, and caught the acrid tang of animal remains.

Already I assumed that I could smell David Greenwood's blood.

He had never returned to the villa, but had died here on the roof of the Siemens Building, in this place of death and the sun.

'You… look at me! What are you doing here?'

I turned from the drainage pipe to find a fair-haired woman in a black business suit calling from the central aisle. She backed away from me, startled to see an intruder kneeling among the parked cars. With one hand she clasped her purse, either protecting her credit cards or reaching for a tear-gas spray.

When I stood up she brushed the blonde hair from her eyes and lowered her head like a pointer.

' Frances?' I asked, unsure of the light. 'Frances Baring?'

'Sinclair? Jesus, that frightened me. You bloody near ruined a new pair of tights. Are you stealing a car?'

'No… checking something. I didn't hear you coming. The sound travels in a peculiar way.'

'Mostly inside your head. Why are you playing with that pipe?'

She stepped towards me and frowned at the hole in the ceiling.

'Did you do this? I work in the property office here. I could have you arrested.'

'Don't bother. I'll put it back.' I took the handkerchief from my pocket and wiped the blood-stains from my fingers. I lifted the drainage pipe and forced it into place, then kicked the loose floor bracket under the Saab. 'Good as new…'

'You're really a very strange man. This garage isn't a Meccano set.' She strolled around me, and then turned towards the parapet. Trying to manoeuvre me into the light, she exposed her nervy beauty to the open air, the lack of confidence and untrusting mouth. Aware of my admiring stare, she donned a large pair of sunglasses, evidently the most potent weapon in her purse. But she stepped forward to steady me when I stumbled against the Saab. 'Paul – are you all right? You look shaky.'

'A little. Pulling that pipe down was an effort. Still, the Chinese boxes are starting to unpack themselves.'

'At last. I saw you on the roof with one of the guards.'

'Halder, yes. He took me on the grand tour.'

'Of what? Security systems?'

'Death. Seven deaths. Or eight, to be exact. We started at the villa and followed Greenwood 's route on May 28.'

'Dear God…' Frances raised a hand to her mouth. 'It sounds gruesome.'

'It was. An extremely graphic reconstruction, with a well-informed commentary, so packed with gory details I nearly missed the subtext. There was even a surprise ending. I feel a lot clearer about everything.'

'What was the surprise?'

'Halder told me who killed Greenwood.'

'So…' Her eyes briefly emptied. 'Who did?'

'Halder claimed he did.'

'And you believe him?'

'Halder's the sort of man who takes a special pride in being honest, especially when it serves his own interests.'

'And where did this happen?'

'He didn't say. But I think I know.'

She picked a spur of plastic from my lapel, trying to delay her question. 'In the garage with the hostages?'

'No. Right here, in this car park. A few feet above where you're standing.'

'No…' She shook her head and backed away from me, as if I had opened one trap-door too many in the floor around her.

'Why here?'

' Frances, I'm sorry…' I hesitated before pressing on. 'My guess is that Greenwood was shot on the roof. He was probably lying wounded against the parapet. I'm surprised you didn't see what happened.'

'No one saw anything. The sun shields were closed. Security moved everyone to the north side of the building.'

'How long did that take?'

'Ten minutes or so. Then we heard some shots. That was the end.'

'It was for Greenwood…' Matter-of-factly, I said: 'There's a cluster of bullet holes in the parapet. Someone filled them in, but forgot to clean the drain pipe.'

'Why bother? It almost never rains here.'

'This time it rained blood. A short deadly shower.' I unfolded my handkerchief and showed Frances the haemoglobin stains.

'Blood?' She picked at the stains with a varnished forefinger, nostrils flicking as they caught some long-lost scent. She stared at a drying smear that my thumb had left on the cuff of her white silk blouse, and smiled brightly. 'I'll get it DNA-tested. If you're right it's part of David. What does it matter where he died?'

'It matters a lot. If Greenwood died here he couldn't have shot the hostages. Someone else ordered them killed. That broadens out the whole picture.'

'Maybe they weren't hostages?'

I followed her eyes as they drifted around the parked cars.

Despite the recent tears, her face was resolute. Once again she had made a course correction, steering me back onto the road she had chosen.

I said: 'They were Greenwood 's partners, not his hostages. None of them ever went near the garage – at least, not until they were dead. They were waiting for David in the TV centre car park.'

'Too many car parks – always a sign of a troubled mind. But why the TV centre? People will kill to get on television, but weren't they going a little far?'

'They wanted to seize the station and expose a scandal at Eden-Olympia. I'm not sure what.'

'Financial swindles?'

'Unlikely. Chauffeurs don't get outraged over corporate skulduggery – it's part of the air they breathe. Have you heard any talk of "ratissages"?'

'Cullings? It's an old French Army term from the Algerian war – thinning out the fedayeen. Not much in use along the Côte d'Azur.'

'I'm not so sure. I was in the Rue Valentin last night…' I gestured at the air, unsure how to explain my interest in an eleven-year-old girl. I leaned against the Saab, my legs aching after the effort of sitting in the Range Rover with the highly strung Halder. ' Frances…'

'What is it? You look worn out. Rest in my car for a minute.'

'I'm fine.'

'Don't talk. I'll give Halder hell for this.' She took the manila envelope from the roof of the Saab and slipped her arm around my shoulders. 'Your wife's a doctor – she ought to look after you more.'

'Patients… they're completely passé.' Glad to feel her strong body against mine, I let her help me through the parked vehicles.

She paused to search the shadows, and approached an open-topped BMW, a similar model to the car I had stolen near the American Express office in Cannes.

Then I recognized the broken brake light, and the heap of estate agents' brochures. Before walking away to her dental appointment Frances had leaned against the car, confident that the world at large would happily submit to the pressure of a handsome thigh. It had never occurred to me that the car was hers, or that the driving keys had slipped from her bag as she checked her teeth.

'A neat little car,' I commented, lying back in the passenger seat. 'Fun to drive?'

'Too much. A joyrider pinched it in Cannes a few days ago. Really thrashed the engine. The garage said he must have been high. Or very repressed.'

'It might have been a woman.'

'No. You can always tell when a man's driven your car. Brakes, accelerator, even the windscreen wipers – they're all keyed up in a peculiar male way.'

I raised the sun visor, and in the vanity mirror noticed a smear of Greenwood 's blood on my cheek. Had Frances dropped the keys deliberately, testing me to see if I could be trained to act impulsively? Already I sensed that I was being auditioned for a role that was about to be assigned to me. I assumed that she had long known the truth about Greenwood 's last moments, that his life had ended on the roof above us. But her grief had been genuine, a touching mix of anger and regret that was impossible to fake.