Question

I cant create a thesis for my introduction. This is my intro to my essay Tell-Tale Heart, Survivor Type and The Real Bad Friend are all short stories that have either a narrator or protagonist who becomes insane due to different causes. In each of these stories the protagonist and narrator are depicted as a normal person who is slowly descending into madness over the course of the story. Although they all deny that they are insane it creates the effect on the readers by questioning their own sanity while the protagonist and narrator are unbeknown to their own. Tell-Tale Heart is a short story