"What?"

With a huge rush of wind a swooping eagle dropped from out of the night sky, with its talons outspread to catch at him. Thor beat and thrashed at it until the great bird flailed backwards, turned, nearly crashed to the ground, recovered itself, and with great slow beats of its wings, heaved itself back up through the air and perched on top of the street lamp. It grasped the lamp hard with its talons and steadied itself, making the whole lamppost quiver very slightly in its grip.

"Go!" shouted Thor at it.

The eagle sat there and peered down at him. A monstrous creature made more monstrous by the effect of the orange light on which it perched, casting huge, flapping shadows on the nearby houses, it had strange circular markings on its wings. These were markings that Kate wondered if she had seen before, only in a nightmare, but then again, she was by no means certain that she was not in a nightmare now.

There was no doubt that she had found the man she was looking for. The same huge form, the same glacial eyes, the same look of arrogant exasperation and slight muddle, only this time his feet were plunged into huge hide boots, great furs, straps and thongs hung from his shoulders, a huge steel horned helmet stood on his head, and his exasperation was directed this time not at an airline check-in girl but at a huge eagle perched on a lamppost in the middle of Primrose Hill.

"Go," he shouted at it again. "The matter is beyond my power! All that I can do I have done! Your family is provided for. You I can do nothing more for! I myself am powerless and sick."

Kate was suddenly shocked to see that there were great gouges on the big man's left forearm where the eagle had got its talons into him and ripped them through his skin. Blood was welling up out of them like bread out of a baking tin.

"Go!" he shouted again. With the ed ge of one hand he scraped the blood off his other arm and flung the heavy drops at the eagle, which reared back, flapping, but retained its hold. Suddenly the man leapt high into the air and grappled himself to the top of the lamppost, which now began to shake dangerously under their combined weight. With loud cries the eagle pecked viciously at him while he tried with great swings of his free arm to sweep it from its perch.

A door opened. It was the front door of Kate's house and a man with grey-rimmed spectacles and a neat moustache looked out. It was Neil, Kate's downstairs neighbour, in a mood.

"Look, I really think - " he started. However, it quickly became clear that he simply didn't know what to think and retreated back indoors, taking his mood, unsatisfied, with him.

The big man braced himself, and with a huge leap hurled himself through the air and landed with a slight, controlled wobble on top of the next lamppost, which bent slightly under his weight. He crouched, glaring at the eagle, which glared back.

"Go!" he shouted again, brandishing his arm at it.

"Gaarh!" it screeched back at him.

With another swing of his arm he pulled from under his furs a great short-handled sledge-hammer and hefted its great weight meaningfully from one hand to another. The head of the hammer was a roughly cast piece of iron about the size and shape of a pint of beer in a big glass mug, and its shaft was a stocky, wrist-thick piece of ancient oak with leather strapping bound about its handle.

"Gaaaarrrh!" screeched the eagle again, but regarded the sledgehammer with keen-eyed suspicion. As Thor began slowly to swing the hammer, the eagle shifted its weight tensely from one leg to the other, in time to the rhythm of the swings.

"Go!" said Thor again, more, quietly, but with greater menace. He rose to his full height on top of the lamppost, and swung the hammer faster and faster in a great circle. Suddenly he hurled it directly towards the eagle. In the same instant a bolt of high voltage electricity erupted from the lamp on which the eagle was sitting, causing it to leap with loud cries wildly into the air. The hammer sailed harmlessly under the lamp, swung up into the air and out over the darkness of the park, while Thor, released of its weight, wobbled and tottered on top of his lamppost, spun round and regained his balance. Flailing madly at the air with its huge wings, the eagle, too, regained control of itself, flew upwards, made one last diving attack on Thor, which the god leapt backwards off the lamppost to avoid, and then climbed up and away into the