I think this book involves you and me and most certainly those living next to us....and our friends, and siblings, and...it's about the influence of a father - present, not present, present but not present - how his relationship IS ours with our God. How we relate to God is, initially, reflective of how we see and relate to whatever father-figure we had growing up.
Hence, "To Own a Dragon." Miller thought it would be cool to own a dragon, but it was a work of fiction, fantasy. That is how "Dad" was to him: fiction, fantasy, imagery. He didn't have one. Maturity has given him the opportunity to reflect on the consequences of this. And that is the book: Miller's reflection on what it means to be a dad; what a dad - without intention, even - teaches his kid. How the kid learns what it is to be a "man."
The book is geared towards the male gender, and Miller makes this incredibly clear from the beginning. As a woman I found it to be very thought-provoking as to my relationship with my own father. An added benefit is Miller's humor, so very funny and freestyle. I enjoyed it. I have given multiple copies away to friends.