What is the author's tone in The Duchess of Bloomsbury Street by Helene Hanff?

The tone of this book, like any well written book, changes as the book progresses through the story. The first part of the book is filled with an optimistic tone that reflects the author's excitement at finally arriving in the country she has always wanted to visit. As the book progresses, however, the tone changes to one of barely controlled temper as Ms. Hanff becomes too accustomed to the preferred treatment she has been receiving and she becomes a bit more demanding of attention. The tone begins to mellow out again as Ms. Hanff sees the end of her trip coming and begins to feel some sadness at having to leave. Finally, the tone becomes one of acceptance and guarded optimism as Ms. Hanff boards the plane that will take her home again.