Ultra: The Underworld of Italian Football by Tobias Jones
The book's strength lies in the author expertly interlacing the history of the ultras movement, covering half a century of the flashpoints, fatalities and shared histories with his own experience embedded with the Cosenza ultras criss-crossing the country in support of this mediocre team, where little of note happens on the pitch.
It's not naïve - the author calls out the bigotry and criminality he sees first hand, and traces the links between the ultras movement and the rise of the far right in Italy and elsewhere. This is tempered with the sense of belonging and brotherhood is that binds these fans together and what makes these extreme form of fandom so intoxicating. A fabulous book.