'We have our own police force. Very discreet and effective, except when you need them. These gewgaw men get in anywhere. Somehow they've bypassed the idea of progress. Dig a hundred-foot moat around the Montparnasse tower and they'd be up on the top deck in three minutes.'

'Does it matter?'

'Not in the way you mean. Though it's irritating to be reminded of the contingent world.'

'A drifting leaf? A passing rain-shower? Bird shit on the sleeve?'

'That sort of thing.' Penrose smoothed himself down, hands pressing his burly chest. 'There's nothing racist, by the way. We're truly multinational – Americans, French, Japanese. Even Russians and east Europeans.'

'Black Africa?'

'At the senior level. We're a melting pot, as the Riviera always has been. The solvent now is talent, not wealth or glamour. Forget about crime. The important thing is that the residents of Eden-Olympia think they're policing themselves.'

'They aren't, but the illusion pays off?'

'Exactly.' Penrose slapped my shoulder in a show of joviality. 'Paul, I can see you're going to be happy here.'

The road climbed the thickly wooded slopes to the north-east of the business park, cutting off our view of Cannes and the distant sea. We stopped at an unmanned security barrier, and Penrose tapped a three-digit number into the entry panel. The white metal trellis rose noiselessly, admitting us to an enclave of architect-designed houses, our home for the next six months.

I peered through the wrought-iron gates at silent tennis courts and swimming pools waiting for their owners to return. Over the immaculate gardens hung the air of well-bred catatonia that only money can buy.

'The medical staff…?' Jane lowered her head, a little daunted by the imposing avenues. 'They're all here?'

'Only you and Professor Walter, our cardiovascular chief. Call it enlightened self-interest. It's always reassuring to know that a good heart man and a paediatrician are nearby, in case your wife has an angina attack or your child chokes on a rusk.'

'And you?' I asked. 'Who copes with sudden depressions?'

'They can wait till morning. I'm in the annexe on the other side of the hill. North facing, a kind of shadow world for the less important.' Penrose beamed to himself, happy to speak frankly.

'The company barons who decide our pecking order feel they're beyond the need of psychiatric attention.'

'Are they?'

'For the time being. But I'm working on it.' Penrose sat up and pointed through the plane trees. 'Slow down, Jane. You're almost home. From now on you're living in a suburb of paradise…'

3 The Brainstorm

A giant cycad threw its yellow fronds across the tiled pathway to a lacquered front door, past a chromium statue of a leaping dolphin. Beyond the bougainvillaea that climbed the perimeter wall I could see the streamlined balconies and scalloped roof of a large art-deco villa, its powder-blue awnings like reefed sails. The ocean-liner windows and porthole skylights seemed to open onto the 1930s, a vanished world of Cole Porter and beach pyjamas, morphine lesbians and the swagger portraits of Tamara de Lempicka. The entire structure had recently been repainted, and a phosphor in the white pigment gave its surface an almost luminescent finish, as if this elegant villa was an astronomical instrument that set the secret time of Eden-Olympia.

Even Jane was impressed, smoothing the travel creases from her trousers when we stepped from the dusty Jaguar. The house was silent, but somewhere in the garden was a swimming pool filled with unsettled water. Reflections from its disturbed surface seemed to bruise the smooth walls of the house. The light drummed against Jane's sunglasses, giving her the edgy and vulnerable look of a studio visitor who had strayed into the wrong film set. Almost without thinking, Penrose stepped forward, took the glasses from Jane's face and placed them firmly in her hands.

A concrete apron sloped from the road to the aluminium shutters of a three-car garage. Parked on the ramp was an olive-green Range Rover of the Eden-Olympia security force. A uniformed guard leaned against the driver's door, a slim, light-skinned black with refined and almost east African features, a narrow nose and steep forehead. He picked the dust from the buttons of his mobile phone with a pocket knife, and watched without comment as we surveyed the house.

Penrose introduced us, his back to the guard, speaking over his shoulder like a district commissioner with a village headman.

'Jane, this is Frank Halder. He'll be within radio call whenever you need him. Frank, help Dr Sinclair with her luggage…'

The guard was about to step into his Range Rover. When he opened the door I noticed a copy of Tender is the Night on the passenger seat. He avoided my eyes, but his manner was cool and self-possessed as he turned to face the psychiatrist.

'Dr Penrose? I'm due in at the bureau. Mr Nagamatzu needs me to drive him to Nice airport.'

'Frank…' Penrose held his fingernails up to the sun and examined the ragged crescents. 'Mr Nagamatzu can wait for five minutes.'

'Five minutes?' Halder seemed baffled by the notion, as if Penrose had suggested that he wait for five hours, or five years. 'Security, doctor, it's like a Swiss watch. Everything's laid down in the machinery. It's high-class time, you can't just stop the system when you feel like it.'

'I know, Frank. And the human mind is like this wonderful old Jaguar, as I keep trying to explain. Mr Sinclair is still convalescing from a serious accident. And we can't have Dr Jane too tired to deal with her important patients.'

'Dr Penrose…' Jane was trying to unlock the Jaguar's boot, hiding her embarrassment over this trivial dispute. 'I'm strong enough to carry my own suitcases. And Paul's.'

'No. Frank is keen to help.' Penrose raised a hand to silence Jane. He sauntered over to Halder, flexing his shoulders inside his linen jacket and squaring up to the guard like a boxer at a weigh-in. 'Besides, Mr Sinclair is a pilot.'

'A pilot?' Halder ran his eyes over me, pinching his sharp nostrils as if tuning out the sweat of travel that clung to my stale shirt. 'Gliders?'

'Powered aircraft. I flew with the RAF. Back in England I have an old Harvard.'

'Well, a pilot…' Halder took the car keys from Jane and opened the boot. 'That could be another story.'

We left Halder to carry the suitcases and set off towards the house. Penrose unlocked a wrought-iron gate and we stepped into the silent garden, following a pathway that led to the sun lounge.

'Decent of him,' I commented to Penrose. 'Is humping luggage one of his duties?'

'Definitely not. He could report me if he wanted to.' Enjoying his small triumph, Penrose said to Jane: 'I like to stir things up, keep the adrenalin flowing. The more they hate you, the more they stay on their toes.'

Jane looked back at Halder, who was steering the suitcases past the gate. 'I don't think he does hate you. He seems rather intelligent.'

'You're right. Halder is far too superior to hate anyone. Don't let that mislead you.'

A spacious garden lay beside the house, furnished with a tennis court, rose pergola and swimming pool. A suite of beach chairs sat by the disturbed water, damp cushions steaming in the sun.

I wondered if Halder, tired of waiting for us, had stripped off for a quick dip. Then I noticed a red beach ball on the diving board, the last water dripping from its plastic skin. Suddenly I imagined the moody young guard roaming like a baseline tennis player along the edge of the pool, hurling the ball at the surface and catching it as it rebounded from the far side, driving the water into a state of panic.

Penrose and Jane walked on ahead of me, and by the time I reached the sun lounge Halder had overtaken me. He moved aside as I climbed the steps.