Next second he sank back again into his chair with his chin upon his breast, rigid and motionless as one dead.

Noticing Dora’s look of surprise at the words he uttered, he set his teeth, steadied himself by dint of great effort, and turning to the man ordered him to show the visitor in. Then, addressing the woman he loved, he added hoarsely:

“I must see this man alone, dearest.”

“You wish me to leave?” she inquired, her pretty face clouded by a sudden expression of bewilderment. He nodded, without replying, and as she moved slowly towards the door, I followed.

“No, Stuart,” he cried anxiously. “No, stay, old fellow, stay! You are my friend, stay!”

Dora turned, glanced at her lover and then disappeared through the doorway, while I returned slowly to where he was standing, staring like one fallen under some occult influence.

“Who is this visitor?” I asked, but before he could reply, the man appeared at the door, and announced:

“Mr Francis Markwick.”

At the same moment there advanced into the room the mysterious individual who had been my conductor on the night of my marriage; the man whose intimate acquaintance with Lady Fyneshade was so puzzling! He was well-groomed and sprucely-dressed in a well-cut frock-coat, tightly-buttoned, and wore a flower and grey suede gloves.

“Ah! my dear Bethune!” he cried, walking towards him with extended hand, without apparently noticing me. “I heard you were back, and have taken the earliest opportunity of calling. Where have you been all this time?” But Jack, thrusting his hands into his pockets, made no reply to this man’s effusiveness. His greeting was frigid, for he merely inclined his head. Suddenly the remembrance of those partially charred letters I had found in Jack’s chambers on the night of the murder of Sternroyd flashed through my brain. In them the name “Markwick” occurred several times, and the writer of one had referred to him as “that vile, despicable coward.” Who had penned these words? Sybil had no doubt written one of the letters I had discovered, but did this condemnation emanate from her? I stood watching him and wondering.