crime committed by someone who had been contented (very cleverly) with using M. Renauld's own plans for throwing the police off the track. The great criminal (as you may remember my remarking to you once) is always supremely simple.”
I nodded.
“Now, to support this theory, the criminal must have been fully cognizant of M. Renauld’s plans. That leads us to Madame Renauld. But facts fail to support any theory of her guilt. Is there anyone else who might have known of them? Yes. From Marthe Daubreuil’s own lips we have the admission that she overheard M. Renauld’s quarrel with the tramp. If she could overhear that, there is no reason why she should not have heard everything else, especially if M. and Madame Renauld were imprudent enough to discuss their plans sitting on the bench. Remember how easily you overheard Marthe’s conversation with Jack Renauld from that spot.”
“But what possible motive could Marthe have for murdering Mr. Renauld?” I argued.
“What motive? Money! M. Renauld was a millionaire several times over, and at his death (or so she and Jack believed) half that vast fortune would pass to his son. Let us reconstruct the scene from the standpoint of Marthe Daubreuil.
“Marthe Daubreuil overhears what passes between Renauld and his wife. So far he has been a nice little source of income to the Daubreuil mother and daughter, but now he proposes to escape from their toils. At first, possibly, her idea is to prevent that escape. But a bolder idea takes its place, and one that fails to horrify the daughter of Jeanne Beroldy! At present M. Renauld stands inexorably in the way of her marriage with Jack. If the latter defies his father, he will he a pauper—which is not at all to the mind of Mademoiselle Marthe. In fact, I doubt if she has ever cared a straw for Jack Renauld. She can simulate emotion, but in reality she is of the same cold, calculating type as her mother. I doubt, too, whether she was really very sure of her hold over the boy's affections. She had dazzled and captivated him, but separated from her, as his father could so easily manage to separate him, she might lose him. But with M. Renauld dead, and Jack the heir to half
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