Invisible Ink by Brian McDonald explores the subtle reasons why good stories work. Dialogue is overt, but writers make a lot of a lot of other choices in their writing that many audience members would never think about. The book contains short, easy-to-digest segments with a variety of interactive exercises and real-life examples. If you want to hone your setups and payoffs, jokes, characters and dialogue, take a read! There are also interesting sections about subplots, handling critique and killing your protagonist. Andrew Stanton and Paul Feig are among Brian's supporters.