20 Master Plots and How to Build Them by Ronald B. Tobias was recommended by
( A good book hiding an even better book )
Still, even in its disparate parts 20 Master Plots was well worth my time for its intelligent discussions about story, plot and morality. If nothing else I would recommend Chapters One and Four for the theory of plot and deep structure.
See also: 20 Master Plots smacks down Plot Versus Character, at least in my febrile imagination.