papers which he carried, "there is nothing that could not wait until to-morrow at a pinch."
"The pinch has come," said Harley. "I am going to interview the two most important witnesses in the Abingdon case."
"To whom do you refer, Mr. Harley?"
Innes stared rather blankly, as he made the inquiry, whereupon:
"I have no time to explain," continued Harley. "But I have suddenly realized the importance of a seemingly trivial incident which I witnessed. It is these trivial incidents, Innes, which so often contain the hidden clue."
"What! you really think you have a clue at last?"
"I do." The speaker's face grew grimly serious. "Innes, if I am right, I shall probably proceed to one of two places: the apartments of Ormûz Khân or the chambers of Nicol Brinn. Listen. Remain here until I 'phone—whatever the hour."
"Shall I advise Wessex to stand by?"
Harley nodded. "Yes—do so. You understand, Innes, I am engaged and not to be disturbed on any account?"
"I understand. You are going out by the private exit?"
"Exactly."
As Innes retired, quietly closing the door, Harley took up the telephone and called Sir Charles Abing-
