Deviance in Estrella de mar was a commodity under jealous guard. Watched by the wary and suspicious chauffeur, who was logging my licence number into his electronic notebook, I freewheeled down the drive past the Mercedes. With its tinted windows, the bodywork seemed both paranoid and aggressive, like medieval German armour, and the nearby villas shared this nervous stance. Razor-glass topped almost every wall, and security cameras maintained their endless vigil over garages and front doors, as if an army of housebreakers roamed the streets after nightfall.

I returned to the Club Nautico, trying to decide on my next move. Elizabeth Shand, just conceivably, had a motive for killing the Hollingers, if only to get her hands on a piece of prime real estate, but she would have chosen a less crude weapon than arson. Besides, she clearly liked the old couple, and the five murders would certainly have been bad for business, frightening away potential property investors.

At the same time she had given me a glimpse into another Estrella de Mar, a world of imported bed-boys and other genial pleasures, and had identified Anne Hollinger for me. Sitting by the television set, I rewound the cassette of the porno-film, then played through the violent scenes again, trying to identify the other participants. How had this maverick and high-spirited young woman found herself in such a crudely exploitative movie? I froze her brave smile to camera as she sat in the tattered wedding dress, and imagined her playing the tape as she injected herself in the bathroom, trying to blot out all memory of the pale-skinned young man who had been determined to humiliate her.

The frightened eyes wept their black ink, and the lipstick skewed across her mouth like a gasp. I reeled back to the moment when the second bridesmaid entered the bedroom and the mirror-door reflected the balcony of the apartment and the sloping streets below.

Again I froze the frame and tried to sharpen the blurred image. A church spire was visible between the balcony rails, its weather-vane silhouetted against a white satellite dish on the roof of a building somewhere near the marina. Aligned together, they virtually pinpointed the apartment's location on the heights above Estrella de Mar.

I sat back and stared at the spire, for the first time unaware of the tennis machine as it fired its balls across the practice court. I realized now that it was this view across the town that I had been intended to see, and not the rape of Anne Hollinger. The police forensic team would have discovered the cassette within moments of searching the fire-gutted bedroom.

Someone had planted the cassette in the video-recorder, after learning that Paula and I were to visit the Hollinger house, confident that Cabrera would be too busy with his autopsy report to re-check the original findings. I remembered the Hollingers' chauffeur, endlessly buffing the old Bentley. Had this melancholy Andalucian become Anne's confidant and even, perhaps, her lover? His threatening stare, far from trying to make me Frank's guilty proxy, might have been an attempt to alert me to some undiscovered evidence.

At eight that evening Paula and I were meeting for dinner at the Restaurant du Cap, but I set off for the harbour an hour early, eager to search for the satellite dish. Pornographic filmmakers often rented expensive apartments for the day, rather than construct stage sets that could provide evidence for the police. The exact location of the rape scene would take me no nearer to the Hollinger murders, but the loose corners of too many carpets had begun to curl under my feet. The more I nailed down, the less likely was I to trip as I moved from one darkened room to the next.

While I walked down to the harbour, past the antique shops and art galleries, I scanned the rooftops of the town. The weather-vane of the Anglican church rose above the Plaza Iglesias, without doubt the one I had glimpsed in the film. I stood on the steps of the church, a white geometrical structure that was a modest replay of Corbusier's Ronchamp Chapel, more space-age cinema than house of God. The notice-board announced forthcoming performances of Eliot's Murder in the Cathedral, meetings of a help-the-elderly charity, and a guided tour of a Phoenician burial site on the southern tip of the peninsula, organized by a local archaeological society.

The weather-vane pointed towards Fuengirola but there was no sign of the satellite dish. Lit by the setting sun, the western skyline of Estrella de Mar ran from the Club Nautico to the ruin of the Hollinger house. A dozen apartment blocks looked down from the high corniche, a cliff-face of mysteries. On the roof of the yacht club a white satellite dish cupped the sky, but its bowl was at least twice the diameter of the modest dish in the video.

The tapas bars and seafood restaurants along the harbour were packed with residents relaxing after their day's work at the sculpture table and potter's wheel. Far from being dismayed by the Hollinger tragedy, they seemed more animated than ever, talking noisily across their copies of the New York Review of Books and the arts supplements of Le Monde and Liberation.

Intimidated by this cultural power-dressing, I stepped into the boatyard beside the marina, comforted by the presence of stripped-down engines and oily sumps. The yachts and motor-cruisers sat in their trestles, revealing their elegant hulls, a geometry graced by speed. Dominating all the other craft in the yard was a fibre-glass powerboat almost forty feet long, three immense outboards at its stern like the genitalia of a giant aquatic machine.

His engine-tuning over for the day, Gunnar Andersson stood beside the craft and washed his arms in a bucket of detergent. He nodded to me, but his narrow, bearded face was as closed and self-immersed as a Gothic saint's. He ignored the evening crowds and followed a flight of martins setting off for the coast of Africa. The flesh of his cheeks and scalp was stretched across the sharp points of his skull, as if constrained by some intense internal pressure. Watching him grimace at the noisy bars, I felt that he controlled his emotions from one second to the next, fearing that if he showed the slightest anger the skin would split and reveal the shrieking bones.

I walked past him, and admired the speedboat and its sculptured prow.

'It's almost too powerful to be beautiful,' I commented. 'Does anyone need to go this fast?'

He dried his hands before replying. 'Well, it's a working ship. It has to earn its keep. The Spanish patrol boats at Ceuta and Melilla can really shift.'

'So it crosses to North Africa?' He was about to move away, but I reached out and shook his hand, forcing him to face me. 'Mr Andersson? I saw you at the service in the Protestant cemetery. I'm sorry about Bibi Jansen.'

'Thank you for coming.' He looked me up and down, and then washed his hands again in the bucket. 'Did you know Bibi?'

'I wish I had. From what everyone says, she must have been great fun.'

'When she was given a chance.' He threw the towel into his work-bag. 'If you didn't know her, why were you there?'

'In a sense I was involved in her… death.' Gambling on the truth, I said: 'My brother is Frank Prentice, the manager of the Club Nautico.'

I expected him to turn on me and show some of the anger he had vented at the funeral, but he took out his tobacco pouch and rolled a cigarette with his large fingers. I guessed that he was already aware of my relationship to Frank.

'Frank? I worked on the engine of his thirty-footer. If I'm right, he hasn't paid me yet.'

'He's in jail in Malaga, as you know. Give me the bill and I'll settle it.'

'Don't worry-I can wait.'

'That could be a long time. He's pleaded guilty.'