Andersson drew on the loose-packed cigarette. Shreds of burning tobacco flew from the glowing tip and sparked briefly against his beard. His eyes roved around the boatyard, avoiding my face. 'Guilty? Frank has a special sense of humour.'

'It's not a joke. This is Spain, and he could serve twenty or thirty years. You don't believe he started the fire?'

Andersson raised his cigarette and scrawled a cryptic symbol on the night air. 'Who can say? So, you're in Estrella de Mar to find out what happened?'

'I'm trying to.'

'But not getting very far?'

'To tell the truth, I've made no headway at all. I've been up to the Hollinger house, talked to people who were there. No one believes Frank started the fire, not even the police. I may have to fly in a couple of detectives.'

'From London?' Andersson seemed more interested in me. 'I wouldn't do that.'

'Why not? They might find something I've missed. I'm not a professional investigator.'

'You'd be wasting your money, Mr Prentice. People in Estrella de Mar are very discreet.' He gestured with a long arm at the villas on the hillside, secure behind their surveillance cameras. 'I've lived here for two years and I'm still not sure if the place is real…'

He left the boatyard and led me along the walkway between the moored yachts and cabin-cruisers. The white-hulled craft seemed almost spectral in the dusk, a fleet waiting to sail on a phantom wind. Andersson stopped at the end of the quay, where a small sloop rode at anchor. Beneath the Club Nautico pennant at the stern was its name: Halcyon. Police exclusion tapes looped along its rails, falling into the water where they drifted like streamers from a forgotten party.

'The Halcyon?' I knelt down and peered through the miniature portholes. 'So this is Frank's boat?'

'You'll find nothing on board to help you. Frank asked Mr Hennessy to sell it for him.'

Andersson stared at the craft, raking his beard with his fingers, a gloomy Norseman exiled among the plastic hulls and radar scanners. As his eyes searched the sky over the town I noticed that he was looking everywhere but at the Hollinger house. His natural aloofness shaded into some unhappy emotion that I could only glimpse around the bony corners of his face.

'Andersson, I need to ask – were you at the party?'

'For the English Queen? Yes, I drank the toast.'

'You saw Bibi Jansen on the upstairs veranda?'

'She was there. Standing with the Hollingers.'

'Did she seem well?'

'Too well.' His face was crossed by flickers of light from the dark water lapping the yachts. 'She was very fine.'

'After the toast she went to her room. Why didn't she come down to meet you and the other guests?'

'The Hollingers… they didn't like her mixing with too many people.'

'Too many of the wrong people? Especially the kind who might have given her acid and cocaine?'

Andersson stared at me wearily. 'Bibi was on drugs, Mr Prentice – the drugs that society approves. Sanger and the Hollingers made her into quiet little Princess Prozac.'

'Better than acid, though, for someone who's overdosed. Or the new amphetamines the chemists are cooking up with their molecular roulette.'

Andersson put a hand on my shoulder, sympathizing with my lack of insight. 'Bibi was a free spirit – her best friends were acid and cocaine. When she took acid she made us part of her dreams. Sanger and the Hollingers reached inside her head and took out the small white bird. They broke its wings, closed the cage again and said to everyone: "Bibi is happy."'

I waited as he sucked back the last of his cigarette smoke, scowling to himself as he overruled his emotions.

'You must have hated the Hollingers. Enough to kill them?'

'Mr Prentice, if I wanted to kill the Hollingers it wouldn't be because I hated them.'

'Bibi was found in the jacuzzi with Hollinger.'

'Impossible 'That they could have had sex together? You know she was pregnant? Were you the father?'

'I was her father. We were good friends. I never had sex with her, even when she asked me.'

'So who was the father? Sanger?'

Andersson wiped his mouth, trying to rid himself of the taste of Sanger's name. 'Mr Prentice, do psychiatrists sleep with their patients?'

'They do in Estrella de Mar.' We climbed the steps from the marina to the harbour road, where the evening crowds were already blocking the traffic. 'Andersson, something nightmarish happened up there, something no one counted on. You don't like looking at the Hollinger house, do you?'

'I don't like looking at anything, Mr Prentice. I dream in Braille.' He hoisted his work-bag on to his shoulder. 'You're a decent man, go back to London. Go home, go on your travels. There might be another attack on you. No one in Estrella de Mar wants you to be frightened He walked away through the crowd, a gloomy gallows-tree swaying above the cheerful diners.

I waited for Paula in the bar of the Restaurant du Cap, striking another name from my cast of suspects. As I listened to Anders-son there had been a hint of complicity, perhaps the same regret for having mocked the Hollingers that Paula had expressed, but I was sure that he could not have killed them. The Swede was too morose, too immersed in his grudge against the world, to be able to act decisively.

By nine-thirty Paula had not arrived, and I assumed that an emergency had kept her at the Clinic. I ate alone at my table, stretching the bouillabaisse as long as I could without attracting the Keswick sisters' curiosity. It was eleven o'clock when I left the restaurant, and the nightclubs along the quay were opening, their music booming across the marina. I paused by the boatyard, and stared at the huge powerboat on which Andersson had been working. I could imagine it outrunning the Spanish police cutters, racing across the Strait of Gibraltar with its cargo of hashish and heroin for the dealers of Estrella de Mar.

Feet rang against the metal steps that led down to the marina. A party of Arab visitors were returning to their craft in the short-term harbour beside the mole. I guessed that they were Middle Eastern tourists who had rented a summer palace at the Marbella Club. They wore full Puerto Banus fig, a dazzle in the dark of white drill, jewelled Rolexes and the plushest silks. One group of middle-aged men and young Frenchwomen boarded a cabin-cruiser tied up near the Halcyon. Expert with mooring lines and engine controls, they were about to set off when the younger men in the second group began to shout from the steps of the mole. They shook their fists and waved their yachting caps at a small, twin-engined speedboat that had slipped its moorings and was gliding silently through the undisturbed water.

As if unaware that he had stolen the craft, the thief stood calmly in the cockpit, thighs pressed against the helm. The beam of the Marbella lighthouse swept the sea, touching his pale arms and hair.

Within moments a chaotic sea-chase had begun. Jointly steered by two of its excited captains, the cabin-cruiser surged from its berth while the startled Frenchwomen clung to the leather banquettes. Unconcerned by the craft bearing down on him, the hijacker continued to motor towards the sea, barely leaving a wake behind him as he saluted the furious young men on the mole. At the last moment he rammed the throttle forward, expertly side-slipping into a lane of calm water between the moored yachts. Too clumsy to turn, the cabin-cruiser ploughed past and clipped the bowsprit of a venerable twelve-metre.

The thief eased back his throttle, seeing that his exit to the open sea was blocked by the cruiser. Changing course, he drove below the lattice footbridge to the central island, a maze of interlocking waterways and exits. Trying to cover every escape route, the cruiser reversed through a cloud of exhaust, then surged forward when the speedboat emerged from the darkness under its nose. Still standing at the helm, legs stylishly braced apart, the thief rolled the wheel and banked around the cruiser's bows. Free at last, the craft porpoised through the rough water towards the advancing waves.