Hercule Poirot and Arthur Hastings have changed throughout the book. Poirot showed he is a great detective who pays much attention to detail while Hastings went from having the "hobby" of being a detective to actually becoming one. The two formed a strong friendship and even though there were some difficulties throughout the process of discovering who was the murderer of Mrs. Inglethorp they knew how to overcome them. The book also portrayed how not all people are what they seem. Therefore, the other characters of the book also changed revealing the positive and negative aspects of themselves.
From the time Hastings came to live at the family's house to when the murder of Mrs. Inglethorp was solved, Poirot, Hastings, John, Mary, Cynthia, along with the other members of the family and the town had to go through many experiences that were not very pleasing because of Mrs. Inglethorp's death. However, the murder of Mrs. Inglethorp was found, so the investigation was successful in the end. The book left many different messages such as that there are times were using one's instinct is necessary and that not everything is what it seems. All the experiences Hastings had at Styles changed him. He became more confident and more like a professional investigator. They also gave him a new friend. Poirot and Hastings are now a detective and his assistant who can solve mysteries in an efficient way. Hastings became a good companion for Poirot since he learned many lessons from him. Also, detective Poirot helped Hastings to start thinking like a detective.
In summary, there were many characters in the story as well as various suspects of Mrs. Inglethorp's death. Each of the characters were different and developed through the story showing who they truly were or also how they were honest about themselves since the beginning. Focusing on Hastings, he came to the house at Styles Court without knowing what would happen. Nevertheless, helping Poirot to solve the case guided Hastings to enhance his skills as a detective because he had a crime that needed to be solved. He also gained a new companion for future cases or adventures.
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https://www.amazon.com/-/es/Agatha-Christie/dp/0525565108