At around 200 pages, this history certainly is short. There is a wide-ranging survey up to the 1900s, and separate sections devoted to Tolkein, C S Lewis, J K Rowling, Pullman and Pratchett, because of their prominence and influence. After that the book basically covers one decade per chapter, telling of the influential rising stars, trends and fresh developments in that period (mostly books, but other media too). The observations are interesting and intelligent, but readily accessible, not weighed down by academia, and the coverage is extensive. (Sometimes funny too: David Lindsay's A Voyage To Arcturus is memorably and accurately described as "a blinding headache of a book"!) The authors tease out the 'speciation' of fantasy, first in its divergence from horror and SF, and then on into different modes: immersive, intrusive and indigenous fantasy; portal worlds; quest series; pocket universes; liminal fantasy; the New Weird, etc.
Much of the material discussed was new to me, particularly from the explosion of the last two decades. Fans of fantasy would be well advised to avoid reading this whilst sitting at a computer with access to amazon... Indeed, so much has been published in recent years that the last couple of chapters are in danger of descending into frantic lists. Trilogies whoosh by in a sentence and entire `movements' come and go in a page or two. I was left mildly distressed that I could never possibly catch up with all the good stuff.
I would like to have seen more discussion of individual style: I would not learn from this book, for instance, that Donaldson's novels are laden with character psychology, or that Eddison's are written in a prose of high splendour. And of course there were a few works not covered that I felt were important (Ricardo Pinto springs to mind, and James Hilton's neglected Lost Horizon). Nevertheless, this is a lively history full of infectious enthusiasm and sensible appreciation, with an extensive appendix of major works and two indexes. A great read.