It isn't a book about self improvement but I found it very inspiring. The Snow Falcon by Stuart Harrison. The characters in it are trying to rebuild their lives that have been torn by some truly horrible things. A boy that has witnessed his father's death and now refuses to speak and the mother trying to make things work. A man, just getting out of jail for a terrible mistake, and is trying to come to terms with his past. It's how they all heal each other makes it so inspiring.