Most of the book talk about make-believe, and being so ashamed of yourself that you pretend to be someone else.
I liked to twist in the story, when the main character decide to come out and admit all that is unspeakable about him, by taking somebody else's story as his own. The others react in disgust to the fact the he used somebody else's work as his own, not from what he actually hid from them.
By reading a bit more about him, I learned that his father was an aeronautical engineer but also a pathological liar and supreme con artist. It puts the epigraph at the beginning, in perspective (Mark Strand, Elegy for My Father) into perspective.