It wasn't Gregor's frenetic barking in the background.

It was the cold screams. The seagulls.

It was dark when the sign for the Larkollen turn-off appeared.

***

Outside the chalet was a Jeep Cherokee, but Harry continued up to the turnaround. No blue BMW there. He parked immediately beneath the chalet. There was no point trying to sneak in; he had already heard the barking when he rolled down the window on the way in.

Harry was conscious that he should have taken a gun with him. Not that there was any reason to assume Arne Albu was armed; he couldn't know that someone craved his life-or to be more precise, his death. But they weren't the only actors in this drama any more.

Harry got out of the car. He couldn't see or hear any gulls now-perhaps they only make noises in daylight, he mused.

Gregor was chained to the railing by the front steps. His teeth glittered in the moonlight, sending cold shivers down Harry's still-sore neck, but he forced himself to approach the baying dog with long, slow strides.

'Do you remember me?' Harry whispered when he was so close he could touch the dog's grey breath. The taut chain quivered behind Gregor. Harry crouched down and, to his surprise, the barking subsided. The rasping sound suggested it had been going on for quite some time. Gregor pushed his front paws forward, lowered his head and completely stopped. Harry held the door handle. It was locked. Could he hear a voice inside? A light was on in the living room.

'Arne Albu!'

No answer.

Harry waited and tried again.

The key wasn't in the lamp. So he found a suitably large stone, climbed over the veranda railing, smashed one of the small panes in the veranda door, reached his hand through and opened the door.

There was no sign of a fight in the room. More a hasty departure. A book lay open on the table. Harry lifted it up. Shakespeare's Macbeth. One line of the text had been ringed with a blue pen. I have no words; my voice is in my sword. He scanned the room but he couldn't see a pen anywhere.

Only the bed in the smallest bedroom had been used. There was a copy of a men's magazine on the bedside table.

A small radio, more or less tuned in to P4 news, babbled quietly away in the kitchen. Harry switched it off. On the worktop was a thawed entrecote steak and broccoli still encased in plastic. Harry took the meat and went to the porch. The dog was scratching at the door and he opened up. A pair of brown puppy-dog eyes stared up at him. Or, to be more accurate, at the entrecote, which had hardly landed with a splat on the step before it was ripped to pieces.

Harry observed the ravenous dog while pondering what to do. If there was anything he could do. Arne Albu didn't read Shakespeare, that much was certain.

When the last scrap of meat was gone, Gregor began to bark with renewed vigour towards the road. Harry walked over to the railing, loosened the chain and just managed to stay on his feet on the wet surface as Gregor tore loose. The dog dragged him down the path, across the road and down the steep incline where Harry could see black waves crashing onto smooth rocks gleaming white in the light of the half-moon. They waded through tall, wet grass which clung to Harry's legs as if it didn't want to let them go, but Gregor didn't stop until pebbles and sand crunched beneath Harry's Doc Martens. Gregor's rounded stump of a tail pointed upwards. They were standing on the beach. It was high tide; the waves almost reached the rigid grass and bubbled as if there was carbon dioxide in the foam left on the sand as the water retreated. Gregor began to bark again.

'Did he take a boat?' Harry asked, half to Gregor and half to himself. 'Was he alone or did he have company?'

He didn't draw a response from either of them. Nevertheless, it was clear the trail ended here. As Harry pulled at the collar, the large Rottweiler refused to budge. So Harry switched on his Maglite and shone it at the sea. All he could see were rows of white waves, like lines of cocaine on a black mirror. There was clearly a gentle slope beneath the water. Harry pulled at the chain again, but then with a desperate howl the dog started to dig in the sand with its paws.

Harry sighed, switched off the torch and walked back to the chalet. He made himself a cup of coffee in the kitchen and listened to the distant barking. After rinsing his cup, he walked back down to the beach and found a gap between rocks to settle down and shelter from the wind. He lit a cigarette and tried to think. Then he pulled his coat tighter around him and closed his eyes.

***

One night they had been in her bed and Anna had said something. It must have been towards the end of the six weeks-and he must have been more sober than usual because he could remember it. She had said that her bed was a ship, and that she and Harry were two castaways, lonely people drifting on the sea, terrified they would sight land. Was that what had happened next? Had they sighted land? He didn't remember it like that. He felt as if he had jumped ship, jumped overboard. Perhaps his memory was playing tricks on him.

He closed his eyes and tried to conjure up an image of her. Not from the time they were castaways, but from the last time he had seen her. They had eaten together. Apparently. She had filled his glass-had it been wine? Had he tasted it? Apparently. She had given him a refill. He had lost his grip on things. Topped up his glass. She had laughed at him. Kissed him. Danced for him. Whispered her usual sweet nothings in his ear. They had piled into bed and cast off. Had that really been so easy for her? Or for him?

No, it can't have been.

But Harry didn't know for sure. He couldn't have said with any confidence that he hadn't been lying in a bed in Sorgenfrigata with a rapturous smile on his lips. He had been reunited with an ex-lover while Rakel lay staring up at a hotel ceiling in Moscow, unable to sleep for fear of losing her child.

Harry huddled up. The cold, raw wind blew right through him as if he were a ghost. These were thoughts he had managed to keep at bay, but now they crowded in on him: if he couldn't know whether he was capable of cheating on the woman he treasured most in his life, how could he know what else he had done? Aune maintained that drink and drugs merely strengthened or weakened qualities latent within us. But who knew for sure what was inside them? Humans are not robots and the chemistry of the brain changes over time. Who had a full inventory of all the things-given the right circumstances and the wrong medication-we are capable of doing?

Harry shivered and cursed. He knew now. Knew now why he had to find Arne Albu and get a confession before others silenced him. It wasn't because his profession had got into his bloodstream or law had become a personal matter; it was because he had to know. And Arne Albu was the only person who could tell him.

Harry closed his eyes again. The low whistle of the wind against the granite could be heard above the persistent, hypnotic rhythm of the waves.

When he opened his eyes, it was no longer dark. The wind had swept away the clouds and the matt stars twinkled above him. The moon had moved. Harry glanced at his watch. He had been sitting there for almost an hour. Gregor was barking madly at the sea. Stiff, he got to his feet and stumbled over to the dog. The gravitational pull of the moon had shifted, the water level had sunk and Harry plodded down what had become a broad sandy beach.

'Come on, Gregor. We won't find anything here.'

The dog snapped at him when he went to take his collar, and Harry automatically jumped back a step. He peered across the water. The moonlight glittered on the black surface, but now he could make out something he hadn't seen when the water was at its highest ebb. It looked like the tips of two mooring poles just above sea level. Harry went to the water's edge and shone the torch.