Stenness walked over to the safe, opened it, and after a few moments’ search he unearthed the cheque-book.

“Now,” Sir Clinton went on, “would you mind turning up the counterfoil numbered 60073?”

Stenness looked up without showing any emotion on his features.

“There’s no such counterfoil in the book,” he admitted.

“But you find 60072 and 60074 there?”

“Yes.”

“Rather a peculiar state of affairs, isn’t it?”

“It is.”

Sir Clinton turned to another subject.

“There’s a bundle of returned cheques in that drawer of the writing-desk, isn’t there?”