A how-to-write book.
Mostly focusing on the details of writing and writing exercises for that. With some Zen.
Also about how to write with things like places to use. (Writing in restaurants and how to be polite about it.) And a lot of encouragement and the psychological effects.
Possibly more use for the short story writer and still more the poet, since a novel, the weight of the accumlated sentences has a lot of effect on the meaning of each sentence.