"Six months already," I mused, "and where are we? You know, Poirot, I
can't help thinking that we ought to--well, to do something."
"Always so energetic, Hastings! And what precisely would you have me
do?"
This was somewhat of a poser, but I was not going to withdraw from my
position.
"We ought to take the offensive," I urged. "What have we done all this
time?"
"More than you think, my friend. After all, we have established the
identity of Number Two and Number Three, and we have learnt more than a
little about the ways and methods of Number Four."