Being a detective is quite difficult. Particularly in Mrs. Inglethorp's case, there are many clues and many interpretations of what could have happened to her the night of her murder. Mr. Poirot continues investigating the case with Mr. Hastings' help. I believe Mr. Hastings has a much better understanding of the situation than in the past while he is also learning how Hercule Poriot thinks. Now they start to look more like two detectives doing an investigation than only Poirot doing it and Hastings studying his actions. However, Mr. Hastings is also starting to show his emotions towards Mary Cavendish even though that does not stop him from noticing her odd behavior.
Overall, Hastings is becoming more like a detective thanks to Poirot's influence, he is improving his analytic skills and acting according to his feelings although he regretted doing so. I also noticed he is beginning to think more like Poirot because he understands him better along with realizing that his own suspicions were wrong. In Mrs. Inglethorp's inquest, Hastings was able to hear the speeches of different people and realized there are different versions of what happened the night of the murder. Him and Poirot will need to continue investigating, but now Poirot has an apprentice who is getting better at the job every day.
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