Many have commented on how brief this work is. There is no arguing the point, as "The Bookshop" is brief as defined by the pages it occupies. Ms. Fitzgerald also writes concisely, however she conveys as much or more than many who would take two or three times the length of her work, to tell the same story. The result would be no better; nothing more would have been related and the reader would have just consumed more time.
The events in the story come to the reader as they affect the central character. We are not privy to every conversation between other characters, nor do we witness their every thought, their every action. Just as we do day to day, we receive and react to information and events, as we are made aware of them. We share the fears, the suspicions, and the insight Florence has, but that is where it ends. We are not taken away from her to hear the plans set in motion by others; we have little advantage over her in terms of information that we alone possess.
I think the book is brilliant because it tells a story the way any of us would have experienced the events if they had happened to us. Ms. Fitzgerald cuts away anything that is remotely extraneous, but what she leaves is beautifully compact and true to life.
I have just started her work "The Blue Flower" which is massive in comparison, should be interesting.