Stride stared at Cooper wildly. ‘Pre-historic tree ferns grew to over a hundred feet. They’re way down there now, under the ground, still there. Fossilized tree ferns. We call them coal.’ He snatched the leaf back from Cooper as if he wasn’t worthy to hold it. ‘So which is the most successful species? The cleverest? The most efficient? The most useful? Humans?’ He laughed. ‘I studied botany. They tried to tell me it was a science; they tried to make me study mycology and phytopathology. They wanted me to look at diagrams of a monocotyledon or analyse the process of hydrotropism. They wanted me to see pistils and radicles and calyxes. But all I saw were miracles everywhere. Miracles of life.’

He stepped out of the bracken and bent down to the ground near the path. He picked up a small piece of quartz. He held it with gentleness, handling it as if it were a living thing, sensitive to his touch.

‘Look at the earth. She looks so attractive, you could stroke her. Her fur is like velvet. But she’s a wild creature, she can never be tamed. A huge beast, sleeping. Or maybe only pretending to be asleep. This is her body.’

Cooper was silent, feeling foolish and embarrassed, like a man who had wandered into the wrong church service and didn’t know what to do when everyone else prayed.

‘The dancers know all about it,’ said Stride. ‘The dancers became part of her body.’

A suggestion of movement on the moor made Cooper look up. For a moment, he thought there were people standing in the trees at the scene of Jenny Weston’s murder – grey shapes that passed each other slowly, leaning to whisper to one another across the sandy earth of the clearing. Then he realized that he was seeing the Nine Virgins themselves, the stones momentarily transformed by the intensity of Stride’s conviction.

‘I can understand why our ancestors worshipped trees,’ said Stride. ‘Can’t you? When you hear a chainsaw in the woods, when you see a JCB and smell new tarmac, don’t you feel it? Don’t you feel, deep inside your head, the cry of “murder”? Do you understand?’

Cooper frowned, wanting to see what he meant. ‘I understand that you’ve found some sort of truth for yourself.’

‘Believe those who are seeking the truth,’ said Stride. ‘But doubt those who say they’ve found it.’

When they got back to the van, Stride seemed rapidly to become exhausted. He collapsed on the cushions, stretched out full-length, limp and breathing raggedly. After a few minutes, he spoke, though his voice was barely loud enough for them to hear.

‘I can still see her face,’ he said.