How can I reshape this paragraph and add in better word choice so that it fits the structure of being a conclusion for a speech based on And Then There Were None by Agatha Christie and The Big Sleep by Raymond Chandler?
Agatha’s and then there were none has evolved within the genre of crime writing. The big sleep has created a main character who actually recognizes himself as being flawed which is different from the other forms of crime fiction where it seems that Chandler has actually spoofed up his way of adapting hard boil crime fiction. Both novels have evidently not misused the characteristics of crime fiction.
The first thing to remember is that a conclusion is going to wrap up your speech by summarizing main points. Make sure that the basic thesis of your speech is included in the first sentence or two, and then the rest of the introduction should summarize.
It sounds like you are comparing the use of “characteristics of crime fiction” in The Big Sleep and And Then There Were None. You have a statement at the end of the paragraph about it. If you want to improve your speech, you should be more specific about how these characteristics are used and what it means. For example, you describe The Big Sleep in more detail than And Then There Were None. You should also describe how the characters are flowing in Christie’s work. An example is this quote from Justice Wargrave
"[There] can be no exceptions allowed on the score of character, position, or probability. What we must now examine is the possibility of eliminating one or more persons on the facts.” (ch 4, p. 155)
This quote identifies one of the major themes of both works: all people have something to hide. It is one of the main elements of the mystery genre. Both books (and all mysteries) rely on the fact that any character could have a secret, and any character could be the culprit.
Another final element you want to make note of is that we usually refer to authors politely by their last names, so it would be “Christie” instead of “Agatha.” Even when typing a speech, it is best to follow convention and capitalize and italicize titles, in case anyone but you is reading it and to keep in practice. You’ll also want to use punctuation, to remind yourself where to pause in your speech. For example, you will want to have a comma after “flawed,” to remind yourself to pause there when speaking.