It was audible, too, to Hanaud, since he answered with a smile:
"But you must bring yourself to think of it, Mademoiselle. After all, he was not so gentle with you that you need show him so much good will."
A slight rush of colour tinged Betty's cheeks. Jim was not quite sure that a tiny accent of irony had not pointed Hanaud's words.
"I saw him sitting here," she replied quickly, "half an hour ago—abject—in tears—a man!" She shrugged her shoulders with a gesture of distaste. "I wish him nothing worse. I was satisfied."
Hanaud smiled again with a curious amusement, an appreciation which Frobisher was quite at a loss to understand. But he had from time to time received an uneasy impression that a queer little secret duel was all this while being fought by Betty Harlowe and Hanaud underneath the smooth surface of questions and answers—a duel in which now one, now the other of the combatants got some trifling scratch. This time it seemed Betty was hurt.
"You are satisfied, Mademoiselle, but the Law is not," Hanaud returned. "Boris Waberski expected a legacy. Boris Waberski needed money immediately, as the first of the two letters which he wrote to Monsieur Frobisher's firm clearly shows. Boris Waberski had a motive." He looked from one to the other of his audience with a nod to drive the point home. "Motives, no doubt, are signposts rather difficult to read, and if one reads them amiss, they lead one very wide astray. Granted! But you must look for your signposts all the same and try to read them aright. Listen again to the Professor of Medicine in the University of Edinburgh! He is as precise as a man can be."
Hanaud's eyes fell again upon the description of Figure F in the treatise still open upon the table in front of him.
"The arrow was the best specimen of a poison arrow which he had ever come across. The poison paste was thickly and smoothly spread over the arrow head and some inches of the shaft. The arrow was unused and the poison fresh, and these poisons retain their energy for many, many years. I tell you that if this book and this arrow were handed over to Jean Cladel, Herbalist, Jean Cladel could with ease make a solution in alcohol which injected from a hypodermic needle, would cause death within fifteen minutes and leave not one trace."
"Within fifteen minutes?" Betty asked incredulously, and from the arm-chair against the wall, where Ann Upcott had once more seated herself, there broke a startled exclamation.
"Oh!" she cried, but no one took any notice of her at all. Both Jim and Betty had their eyes fixed upon Hanaud, and he was altogether occupied in driving his argument home.