I’m a sucker for good “recipe” books on writing technique. and this looks like a particularly good one. Instead of the crit-lit hobby-horse riding or cultural marxturbation one risks with this genre, it breaks down children’s literature into a dozen or so storytelling/mythic categories. And while it focuses on children’s stories, from what I could see browsing through it the analyses are wholly relevant to young-adult and mainstream adult fiction.
I.e.: it’s more in the Farnsworth vein than the Krentz coven as far as writing-technique books go.