Under cover of the conflagration the cunning Eurasian had escaped.  Every possible means had been taken to intercept him, and whilst Gatton, inspired by I know not what hopes, had hastened to the burning Bell House, I had set out in the police car in pursuit of Dr. Damar Greefe accompanied by Detective-Sergeant Blythe—­upon whom, apparently, the onus of the fiasco rested.

In despite of these measures, the hunted man had made good his retreat; and Blythe and I had entered the outskirts of London without once sighting the car in which Dannar Greefe had fled.

No communication reached me on the following morning, and I found myself, consumed with impatient curiosity, temporarily out of touch with Gatton.  Then, shortly after mid-day, came a telegram: 

“Endeavor induce Sir Eric come to your house eight to-night.  Will meet him there.  Gatton.”

Welcoming any ground for action—­since to remain passive at such a time was torture—­I called at once at Coverly’s chambers.  He was out.  But I left an urgent written message for him, and in the hope of finding him with Isobel, hurried to her flat.  He had not been there that day, however; and now I could only hope that he would return to his rooms in time to keep the appointment.  For that Gatton had some good reason for suggesting the meeting I did not doubt.

Gatton and I were now agreed that Dr. Damar Greefe, if not directly responsible for the death of Sir Marcus, at least had been an accessory to his murder.  At any rate he had shown his hand; firstly, in the attempted assault upon myself by his Nubian servant and secondly, by the devilish device whereby he had propelled some sort of gas projectile (for this we now knew it to have been) from the tower of Friar’s Park into my room at the Abbey Inn.  I had, then, become obnoxious to him; he evidently regarded my continued existence as a menace to his own.

Two explanations of his attitude presented themselves:  one, that my inquiries had led me daily nearer to the heart of the mystery; or, two, that the doctor’s mysterious associate, the possessor of the green eyes, had adopted an attitude towards myself which the Eurasian had counted sooner or later as certain to compromise him.  In short, whilst it was sufficiently evident to me that these mysterious people residing at Upper Crossleys were the criminals for whom New Scotland Yard was searching, no definite link between their admittedly dangerous activities and the crime we sought to unravel, had yet been brought to light.

On the other hand, whilst it was not feasible to suppose that any relationship existed between Sir Eric, the new baronet, and the Eurasian, or the woman associated with the Eurasian, I was quite well aware that, equally, there was no evidence to show that such an association did not exist.

I longed to be able to offer some consolation to Isobel, who at this time was passing through days and nights of dreadful apprehension; but beyond imparting to her some of my own personal convictions, I was unable to say honestly that the complicity of Coverly in the murder was definitely and legally disproved.