A well-written and well-organized book that is nevertheless shot through with fatal flaws.
The author talks about the importance of studying fascist ideology and establishing a "fascist minimum" (that is, the minimum qualities which would enable someone to distinguish between a fascist and non-fascist ideology, regime, movement, whatever) and instead spends the entirety of its not-inconsiderable length talking about a handful of fascist "great men" ranging from Hitler and Mussolini to the likes of Sir Oswald Mosley, a risible figure who seems to be included only because he's English. And speaking of the English people the author presumes to build an argument for British exceptionalism, where he says British people were immune to the charms of fascist ideology thanks at least in part to good old fashioned Protestanism, an argument that he himself destroys in the text by pointing out that the Nazis were most successful in Protestant regions of Germany.
Fascism outside of Germany, Italy, France and Britain is ignored, leaving out everything from Russian Black Hundreds, Romanian Iron Guards, Spanish and Lebanese Falangists, Mexican Synarchists and so on. And while some argument might perhaps be made that these groups were not "really" fascist it's an argument that has to be made in a book that purports to be a history of that ideology.
The book also plays up the anti-capitalist rhetoric of fascist leaders and theorists without detailing that they use a completely different definition of capitalism than critics of that economic system from the Left. While leftists use "capitalism" to mean an economic system characterized by private control of the means of production and wage labor and propose to replace it with collective control of those, fascists call "capitalism" decadent and propose to fix its problems by making business owners less greedy and more patriotic. Yes, fascism economics really is just a bunch of stupid pie-in-the-sky platitudes and capitalists did in fact make out like bandits everywhere fascism actually came to power.
Finally (and infuriatingly) Eatwell makes a number of whataboutist arguments, claiming that atrocities against Italian civilians by the Nazis' lickspittle Salo Republic for example were "provoked" by communists. This is straight up Nazi apologetics in a book that's supposed to be a serious history.
I suggest anyone interested in the subject read Paxton's much better and much shorter "Anatomy of Fascism" instead.