Well, I said wearily, "I suppose some one must have stepped on it." 36 "Exactly," said Poirot, in an odd voice. 
Poirot didn't think it was an accident that someone stepped on it.
mnli hypothesis: Poirot didn't think it was an accident that someone stepped on it. premise: Well, I said wearily, "I suppose some one must have stepped on it." 36 "Exactly," said Poirot, in an odd voice. 