“Then, to my intense surprise, he shook his head decidedly.
«No, my friend.»
«Oh, look here, why not?»
«Two is enough for a secret.»
«Well, I think it is very unfair to keep back facts from me.» «I am not keeping back facts. Every fact that I know is in your possession. You can draw your own deductions from them.
This time it is a question of ideas.»
«Still, it would be interesting to know.»
Poirot looked at me very earnestly, and again shook his head.
«You see,» he said sadly, «you have no instincts.»”