Janet Pembroke looked straight at me, and as she spoke a growing look of horror came into her eyes.
"I have promised to be truthful," she said, "so I must tell you that there have been moments when I have felt the impulse to kill Uncle Robert; but it was merely a passing impulse, the result of my own almost uncontrollable temper. The thought always passed as quickly as it came, but since you ask, I must admit that several times it did come."
Laura threw her arms around Janet with a hearty caress, which I knew was meant as an atonement for the shadow of doubt she had recently felt.
"I knew it!" she exclaimed. "And it is your supersensitive honesty that makes you confess to that momentary impulse! Any one so instinctively truthful is incapable of more than a fleeting thought of such a wrong."
I think that at that moment I would have given half my fortune to feel as Laura did; but what Janet had said did not seem to me so utterly conclusive of her innocence. Indeed, I could not evade an impression that sudden and violent anger was often responsible for crime, and in case of a fit of anger intense enough to amount practically to insanity, might it not mean the involuntary and perhaps unremembered commission of a fatal deed? This, however, I immediately felt to be absurd. For, though a crime might be committed on the impulse of a sudden insanity of anger, it could not be done unconsciously. Therefore, if Janet Pembroke was guilty of her uncle's death, directly or indirectly, she was telling a deliberate falsehood; and if she was not guilty, then the case was a mystery that seemed insoluble. But insoluble it should not remain. I was determined to pluck the heart out of this mystery if it were in power of mortal man to do so. I would spare no effort, no trouble, no expense. And yet, like a flash, I foresaw that one of two things must inevitably happen: should I be able to prove Janet innocent, she should be triumphantly acquitted before the world; but if, on the contrary, there was proof to convince even me of her guilt, she must still be acquitted _before the world_! I was not so inexperienced in my profession as not to know just what this meant to myself and to my career, but I accepted the situation, and was willing, if need be, to take the consequences.