Kaeuper, who has long been interested in the question of public order in the later Middle Ages, argues in this book that it is a mistake to look at chivalry as an ideal which had only a positive impact. Yes, indeed, knights often fought to uphold law and religion, and believed it was their duty to do so; at the same time, knights believed they had an inherent right to exercise violence in whatever cause they chose, and sometimes for no other reason than to defend their own prickly honor.
In other words, chivalry was a troublesome and ambiguous ideal, as much problem as solution.
To illustrate this, Kaeuper takes the reader on a fascinating tour of all kinds of medieval chivalric literature. All of it, he says, was reformist in nature, even the romances which were primarily meant to entertain. But reform could mean many things: knights should control their violence; or, knights should remember that they are fighters first.
The best part of this book is the masterly way Kaeuper allows us to see all the different ways medieval writers and their audiences thought about knighthood. It is quite an achievement.