Cameron paid no attention to his father's words. “It has really no bearing, Sir, but I remember saying as I offered a five-pound cheque, 'I wish it was fifty.'”

“And what reply did Mr. Potts make?” said Mr. Rae, with quiet indifference, as if he had lost interest in this particular feature of the case.

Again Cameron hesitated.

“Come, out with it!” said his father impatiently.

His son closed his lips as if in a firm resolve. “It really has nothing whatever to do with the case.”

“Play the game, old man,” said Dunn quietly.

“Oh, all right!” said Cameron. “It makes no difference anyway. He said in a joke, 'You could easily make this fifty; it is such mighty poor writing.'”

Still Mr. Rae showed no sign of interest. “He suggested in a joke, I understand, that the five-pound cheque could easily be changed into fifty pounds. That was a mere pleasantry of Mr. Potts', doubtless. How did the suggestion strike you, Mr. Allan?”

Allan looked at him in silence.

“I mean, did the suggestion strike you unpleasantly, or how?”