“I sympathize with your suspicions, Mr. Harley,” said the physician dourly, “but you are wasting your time.”  A touch of the old acidity crept back into his manner.  “My certificate will be ‘syncope due to unusual excitement’; and I shall stand by it.”

“You are quite entitled to your own opinion,” Harley conceded, “which if I were in your place would be my own.  But what do you make of the fact that Sir Charles received a bogus telephone message some ten minutes before my arrival, as a result of which he visited Mr. Wilson’s house?”

“But he’s attending Wilson,” protested the physician.

“Nevertheless, no one there had telephoned.  It was a ruse.  I don’t assume for a moment that this ruse was purposeless.”

Doctor McMurdoch was now staring hard at the speaker.

“You may also know,” Harley continued, “that there was an attempted burglary here less than a week ago.”

“I know that,” admitted the other, “but it counts for little.  There have been several burglaries in the neighbourhood of late.”

Harley perceived that Doctor McMurdoch was one of those characters, not uncommon north of the Tweed, who, if slow in forming an opinion, once having done so cling to it as tightly as any barnacle.

“You may be right and I may be wrong,” Harley admitted, “but while your professional business with Sir Charles unfortunately is ended, mine is only beginning.  May I count upon you to advise me of Miss Abingdon’s return?  I particularly wish to see her, and I should prefer to meet her in the capacity of a friend rather than in that of a professional investigator.”

“At the earliest moment that I can decently arrange a meeting,” replied Doctor McMurdoch, “I will communicate with you, Mr. Harley.  I am just cudgelling my brains at the moment to think how the news is to be broken to her.  Poor little Phil!  He was all she had.”

“I wish I could help you,” declared Harley with sincerity, “but in the circumstances any suggestion of mine would be mere impertinence.”  He held out his hand to the doctor.

“Good-night,” said the latter, gripping it heartily.  “If there is any mystery surrounding poor Abingdon’s death, I believe you are the man to clear it up.  But, frankly, it was his heart.  I believe he had a touch of the sun once in India.  Who knows?  His idea that some danger threatened him or threatened Phil may have been merely—­” He tapped his brow significantly.

“But in the whole of your knowledge of Sir Charles,” cried Harley, exhibiting a certain irritation, “have you ever known him to suffer from delusions of that kind or any other?”

“Never,” replied the physician, firmly; “but once a man has had the sun one cannot tell.”

“Ah!” said Harley.  “Good-night, Doctor McMurdoch.”