“Something alive?” he asked laconically. “Likely to bite?”

“Er—no!” replied Mr. Tertius. “No—they won’t bite. The fact is,” he went on, gingerly opening the bag, “this—er—this, or these are they.”

Professor Cox-Raythwaite bent his massive head and shoulders over the little bag and peered narrowly into its obscurity. Then he started.

“Good Lord!” he exclaimed. “A glass tumbler! And—is it a sandwich? Why, what on earth——”

He made as if to pull the glass out of the bag, and Mr. Tertius hastily seized the great hand in an agony of apprehension.

“My dear Cox-Raythwaite!” he said. “Pray don’t! Allow me—presently. When either of these objects is touched it must be in the most, quite the most, delicate fashion. Of course, I know you have a fairy-like gentleness of touch—but don’t touch these things yet. Let me explain. Shall we—suppose we sit down. Give me—yes—give me one of your cigars.”

The Professor, plainly mystified, silently pointed to a cigar box which stood on a corner of his desk, and took another look into the bag.

“A sandwich—and a glass!” he murmured reflectively. “Um! Well?” he continued, going back to his chair and dropping heavily into it. “And what’s it all about, Tertius? Some mystery, eh?”

Mr. Tertius drew a whiff or two of fragrant Havana before he replied. Then he too dropped into a chair and pulled it close to his friend’s desk.

“My dear Professor!” he said, in a low, thrilling voice, suggestive of vast importance, “I don’t know whether the secret of one of the most astounding crimes of our day may not lie in that innocent-looking bag—or, rather, in its present contents. Fact! But I’ll tell you—you must listen with your usual meticulous care for small details. The truth is—Jacob Herapath has, I am sure, been murdered!”