'And I can imagine how the Hollingers felt as all this cement crawled up the hill towards them. Were they popular here? Hollinger was rich enough to put a spoke into a lot of wheels.'

'They were fairly popular. We didn't see too much of them at the club, though Hollinger was a major investor. I suspect they assumed it was going to be for their exclusive use.'

'But then the gold medallions started to arrive?'

'I don't think they worried about gold medallions. Gold was one of Hollinger's favourite colours. Estrella de Mar had begun to change. He and Alice were more put off by the art galleries and the Tom Stoppard revivals. They kept to themselves. In fact, I believe he was trying to sell his interest in the club.'

Hennessy reluctantly followed me along the terrace. A narrow balcony circled the house and led to a stone staircase that climbed the hillside fifty feet away. A grove of lemon trees had once filled the bedroom windows with their oily scent, but the fire-storm had driven through them, and now only the charred stumps rose from the ground like a forest of black umbrellas.

'Good God, there's a fire escape…' I pointed to the cast-iron steps that descended from a doorway on the first floor. The massive structure had been warped by the heat, but still clung to the stone walls. 'Why didn't they use this? They would have been safe in seconds.'

Hennessy removed his hat in a gesture of respect for the victims. He stood with his head bowed before speaking. 'Charles, they never left their bedrooms. The fire was too intense. The whole house was a furnace.'

'I can see that. Your local fire brigade didn't even begin to get it under control. Who alerted them, by the way?'

Hennessy seemed hardly to have heard me. He turned his back on the house, and gazed at the sea. I sensed that he was telling me only what he knew I would learn elsewhere.

'As a matter of fact, the alarm was raised by a passing motorist. No one called the fire services from here.'

'And the police?'

'They didn't arrive until an hour later. You have to understand that the Spanish police leave us very much to ourselves. Few crimes are ever reported in Estrella de Mar. We have our own security patrols and they keep an eye on things.'

'The police and fire services were called only later…' I repeated this to myself, visualizing the arsonist making his escape across the deserted terrace and then climbing the outer wall as the flames roared through the great roof. 'So, apart from the housekeeper and her husband there was no one here?'

'Not exactly.' Hennessy replaced his hat, lowering the brim over his eyes. 'As it happens, everyone was here.'

'Everyone? Do you mean the staff?'

'No, I mean…' Hennessy gestured with his pale hands at the town below. 'Le tout Estrella de Mar. It was the Queen's birthday. The Hollingers always threw a party for the club members. It was their contribution to community Ufe-a touch of noblesse oblige about it, I have to admit, but they were rather nice shows. Champagne and excellent canapes…'

I cupped my hands and stared at the Club Nautico, visualizing the entire membership decamping to the Hollinger mansion for the loyal toast. 'The fire took place on the night of the party… that was why the club had closed. How many people were actually here when it started?'

'Everyone. I think all the guests had arrived. I suppose there were about… two hundred of us.'

'Two hundred people?' I walked back to the south face of the house, where the balcony overlooked the swimming pool and terrace. I imagined the trestle tables decked in white cloths, the ice-buckets gleaming in the evening lights, and the guests chattering beside the unruffled water. 'There were all these people here, at least two hundred of them, and no one entered the house and tried to save the Hollingers?'

'Dear boy, the doors were locked.'

'At a party? I don't get it. You could have broken in.'

'Security glass. The house was filled with paintings and objects d'art, not to mention Alice 's jewellery. In previous years there'd been pilfering and cigarette burns on the carpets.'

'Even so. Besides, what were the Hollingers doing indoors? Why weren't they out here mingling with their guests?' *

'The Hollingers weren't the mingling type.' Hennessy gestured patiently. 'They'd greet a few old friends, but I don't think they ever joined the other guests. It was all rather regal. They kept an eye on things from the first-floor veranda. Hollinger proposed the Queen's toast from there, and Alice would wave and acknowledge the cheers.'

We had reached the swimming pool, where Miguel was raking the floating debris from the water at the shallow end. Piles of wet charcoal lay on the marble verge. The ice-bucket floated past us, an unravelled cigar inside it.

'David, I can't understand all this. The whole thing seems…' I waited until Hennessy was forced to meet my eyes. 'Two hundred people are standing by a swimming pool when a fire starts. There are ice-buckets, punchbowls, bottles of champagne and mineral water, enough to dowse a volcano.

But no one seems to have moved a finger. That's the eerie thing. No one called the police or fire brigade. What did you do – just stand here?'

Hennessy had begun to tire of me, his gaze fixed on his car. 'What else was there to do? There was tremendous panic, people were falling into the pool and running off in all directions. No one had time to think of the police.'

'And what about Frank? Was he here?'

'Very much so. We stood together during the Queen's toast. After that he started circulating, as he always does. I can't be sure I saw him again.'

'But in the minutes before the fire started? Tell me, did anyone see Frank light the fire?'

'Of course not. It's unthinkable.' Hennessy turned to stare at me. 'For heaven's sake, old chap, Frank is your brother.'

'But he was found with a bottle of ether in his hands. Didn't it strike you as a little odd?'

'That was three or four hours later, when the police arrived at the club. It may have been planted in his apartment, who knows?' Hennessy patted my shoulders, as if reassuring a disappointed member of his Lloyd's syndicate. 'Look, Charles, give yourself time to take it all in. Talk to as many people as you want-they'll all tell you the same story, appalling as it is. No one thinks Frank was responsible, but at the same time it's not clear who else could have started the fire.'

I waited for him as he walked around the pool and spoke to Miguel. A few banknotes changed hands, which the Spaniard slipped into his pocket with a grimace of distaste. Rarely taking his eyes from me, he followed us on foot as we drove past the ash-covered tennis court. I sensed that he wanted to speak to me, but he operated the gate controls without a word, a faint tic jumping across his scarred cheek.

'Unnerving fellow,' I commented as we rolled away. 'Tell me, was Bobby Crawford at the party? The tennis professional?'

For once Hennessy answered promptly. 'No, he wasn't. He stayed behind at the club, playing tennis with that machine of his. I don't think he cared overmuch for the Hollingers. Nor they for him…'

Hennessy returned us to the Club Nautico, and left me with the keys to Frank's apartment. When we parted at the door of his office he was clearly glad to be rid of me, and I guessed that I was already becoming a mild embarrassment to the club and its members. Yet he knew that Frank could not have started the fire or taken even the smallest role in the conspiracy to kill the Hollingers. The confession, however preposterous, had stopped the clock, and no one seemed able to think beyond his guilty plea to the far larger question mark that presided over the gutted mansion.

I spent the afternoon tidying Frank's apartment. I replaced the books on the shelves, remade the bed and straightened the dented lampshades. The grooves in the sitting-room rugs indicated where the sofa, easy chairs and desk had stood before the police search. Pushing them back into place, I felt like a props man on a darkened stage, preparing the scene for the next day's performance.