‘That’s splendid,’ Alleyn said. ‘I hope I won’t have to trouble you. Here I go.’

‘God bless you,’ they said in their practical way.

He had another look at the wall. The iron pegs went down at fairly regular intervals on either side of one corner. The well itself was six feet by three. Alleyn ducked under the bottom rail, straddled the corner with his back to the well, knelt, took his weight on his forearms, wriggled backwards and groped downwards with his right foot.

‘Easy now, easy,’ said both the Dominicans. He looked up at Brother Dominic’s sandalled feet, at his habit and into his longlipped Irish face. ‘I have you held,’ said Brother Dominic and gave a little strain on the rope to show that it was so.

Alleyn’s right foot found a peg and rested on it. He tested it, letting himself down little by little. He felt a gritting sensation and a slight movement under his foot but the peg took his weight.

‘Seems OK,’ he said through Father Denys’s handkerchief.

He didn’t look up again. His hands, one after the other, relinquished the edge and closed, right and then left, round pegs. One of them tilted, jarred and ground its way out of its centuries-old housing. It was loose in his hand and he let it fall. So long, it seemed, before he heard it hit the water. Now he had only one handhold and his feet but the rope sustained him. He continued down. His face was close to the angle made by the walls and he must be careful lest he knock his head-lamp against stone. It cast a circle of light that made sharp and intimate the pitted surface of the rock. Details of colour, irregularities and growths of some minute lichen passed upwards through the light as he himself so carefully sank.

Already the region above seemed remote and the voices of the Dominicans disembodied. His world was now filled with the sound of running water. He would have smelt water, he thought, if it had not been for that other growing and deadly smell. How far had he gone? Why hadn’t he asked Brother Dominic for the actual depth of the well? Thirty feet? More? Would the iron pegs have rusted and rotted in the damper air?

The peg under his left foot gave way. He shouted a warning and his voice reverberated and mingled with Brother Dominic’s reply. Then his right foot slipped. He hung by his hands and by the rope. ‘Lower away,’ he called, released his hold, dangled and dropped in short jerks fending himself clear of the two walls. The voice of the stream was all about him.

A sudden icy cold shock to his feet came as a surprise. They were carried aside. At the same moment he saw and grabbed two pegs at shoulder level. ‘Hold it! Hold it! I’m there.’