It is not sufficient that such and such particulars seem to point to him; it must be all or nothing.

This is infallible.
Now, in this case, how have I reached the culprit?
Through proceeding by inference from the known to the unknown.

I have examined his work; and I have formed an idea of the worker.

Reason and logic lead us to what?
To a villain, determined, audacious, and prudent, versed in the business.
And do you think that such a man would neglect a precaution that would not be omitted by the stupidest tyro?
It is inconceivable.

What! this man is so skillful as to leave such feeble traces that they escape Gevrol's practised eye, and you think he would risk his safety by leaving an entire night unaccounted for?
It's impossible! I am as sure of my system as of a sum that has been proved.