Although I think you have the right idea, your thesis is weakened by its grammatical errors. You could rewrite it like this: In the novel, The Count of Monte Cristo, by Alexandre Dumas, the themes of love and forgiveness work together as, through finding love, the Count also finds his way to forgiveness and "ultimate bliss."
I'm not sure exactly what you're asking about topic sentences. Do you mean in addition to the thesis? Do you mean in the same or different paragraphs? I'm happy to help, but I need to understand what you're asking a little better. :-)