I'm in the process of self-editing my novel again, and it's getting as streamlined as I can get it. I've written a realistic fiction novella about different mental illnesses, and I was thinking of sending off a few query letters, but I don't know who is looking for the kind of book I've written. Mental illness apparently isn't a topic covered in most fiction. I haven't found anybody who'll take it, and I am looking for suggestions on how to structure a query letter about it. If not, I can go with self-publishing, but I was hoping to see what others thought of it.