"And the result of your meditations ...?"
"To begin with," said Rénine, refusing to be put out of countenance, "I have submitted all these cases to a comprehensive survey, which hitherto no one else had done. This enabled me to discover their general meaning, to put aside all the tangle of embarrassing theories and, since no one was able to agree as to the motives of all this filthy business, to attribute it to the only class of persons capable of it."
"That is to say?"
"Lunatics, your excellency."
M. de Lourtier-Vaneau started:
"Lunatics? What an idea!"
"M. de Lourtier, the woman known as the lady with the hatchet is a madwoman."
"But she would be locked up!"
"We don't know that she's not. We don't know that she is not one of those half-mad people, apparently harmless, who are watched so slightly that they have full scope to indulge their little manias, their wild-beast instincts. Nothing could be more treacherous than these creatures. Nothing could be more crafty, more patient, more persistent, more dangerous and at the same time more absurd and more logical, more slovenly and more methodical. All these epithets, M. de Lourtier, may be applied to the doings of the lady with the hatchet. The obsession of an idea and the continual repetition of an act are characteristics of the maniac. I do not yet know the idea by which the lady with the hatchet is obsessed but I do know the act that results from it; and it is always the same. The victim is bound with precisely similar ropes. She is killed after the same number of days. She is struck by an identical blow, with the same instrument, in the same place, the middle of the forehead, producing an absolutely vertical wound. An ordinary murderer displays some variety. His trembling hand swerves aside and strikes awry. The lady with the hatchet does not tremble. It is as though she had taken measurements; and the edge of her weapon does not swerve by a hair's breadth. Need I give you any further proofs or examine all the other details with you? Surely not. You now possess the key to the riddle; and you know as I do that only a lunatic can behave in this way, stupidly, savagely, mechanically, like a striking clock or the blade of the guillotine...."
M. de Lourtier-Vaneau nodded his head: