“What?” Cayley looked up suddenly. Bill’s back moved slowly along, his fingers beating a tattoo on the shelves as he walked.

“Er⁠—no,” said Cayley, with a little laugh. An awkward, uncomfortable little laugh, it seemed to Bill.

“Nor do I.” He was past the sermons now⁠—past the secret door⁠—but still tapping in the same aimless way.

“Oh, for God’s sake sit down,” burst out Cayley. “Or go outside if you want to walk about.”

Bill turned round in astonishment.

“Hallo, what’s the matter?”

Cayley was slightly ashamed of his outburst.

“Sorry, Bill,” he apologized. “My nerves are on edge. Your constant tapping and fidgeting about⁠—”

“Tapping?” said Bill with an air of complete surprise.