Watch footage of almost any royal walkabout and the same small drama repeats. Someone has stood behind a barrier for two hours, supermarket flowers going limp in the sun. The moment arrives, a few words pass, and afterward, talking to a local reporter, that person can quote their own sentence exactly and recall nothing of what came back. Catherine, Princess of Wales, has been on the receiving end of that exchange since 2011, thousands of times over, in car parks and hospital corridors and school gyms. The latest round of commentary, including royal author Catherine Mayer telling Marie Claire that Kate "melds more easily" into the family and has grown "quite close" to one of its members, reads all of it as personality. The harder subject is the role, which was designed and running long before she walked into it.

Most coverage treats fitting into the House of Windsor as a character test, passed or failed according to temperament, upbringing, and whether you can hold your nerve on a windy pier in February. It is a flattering assumption, because it keeps the story human and the institution offstage. What a new arrival actually joins is a set of procedures with a family attached: the schedule, the tailoring, the discipline of saying warm things that cannot be quoted against you a decade later. Kate's apparent ease looks like a professional skill, learned and maintained under floodlights. To see what that skill costs and who drew up its rules, look at the woman who practiced it longest.

Craig Brown, who once took Princess Margaret apart into 99 Glimpses, does something similar and stranger with Elizabeth II in Q. He skips the march through reigns and prime ministers and assembles her out of short, mordantly funny pieces: interlocking prisms of anecdote, cultural observation, and scenes so small they seem like offcuts until they accumulate into an argument. That argument rests on a fact that sounds like a riddle. For most of a century she was the most recognizable person alive, her likeness circulating on stamps, coins, and magazine covers more widely than almost any face in history, and she probably met more people than anyone who has ever lived.

She still left almost no personal impression. Those who met her remembered their own words perfectly and could rarely reproduce hers at all. Brown's method treats that emptiness as the subject. Piece by piece, the book traces how a sovereign's public face gets built and then maintained, with press coverage doing the heaviest work: an apparatus of photographers and correspondents that turned every hat and handshake into copy, while ceremony and duty supplied the daily script. The blankness was manufactured, kept up every working day, at enormous cost in ordinary conversation. Comedy is a soft instrument for hard questions, and Brown's affection for his subject lets the institution off lightly.

The empire, the money, the deference that made all of it possible sit at the edges of the frame while the funny detail takes the center. A book organized around glimpses starts to resemble the thing it describes: brilliant surface, locked interior. Jokes arrive where judgments should, and the reign's political record gets less pressure than its social absurdities. The diagnosis still holds. Brown is describing the management of image as a full-time occupation with no retirement, one that measures success by how little of a person survives in public view. That is a claim about the job, which is why it travels forward to the present Princess of Wales.

Q keeps to its own subject and describes the working conditions Catherine inherited, through the person who set the standard for surviving them. If you like your history in fragments, sharp and slightly wicked, with a serious point assembling itself behind the jokes, it is good company for a weekend. What stays with you afterward is the arithmetic of the thing: the most photographed woman of her century met more people than almost anyone in history, spoke to them for decades, and left them holding only their own sentences. She did not consider that a failure. She considered it the work.