Poirot, I exclaimed, with relief, and seizing him by both hands, I dragged him into the room. 
Poirot was now back and I was sorry that he would take over what I now considered my own investigation. 
mnli hypothesis: Poirot was now back and I was sorry that he would take over what I now considered my own investigation.  premise: Poirot, I exclaimed, with relief, and seizing him by both hands, I dragged him into the room. 