In my opinion, this book sets the standard for both good text books and good history writing. Duffin covers a variety of topics in the history of medicine, never attempting an exhaustive history and instead selecting key events and example to highlight relevant trends and issues. The book is written as an introductory text book for medical students, but it serves the general public just as well.
Perhaps the best thing about the book is Duffin's masterful writing. She keeps the narrative engrossing over 15 chapters, each loaded with pictures, quotes and anecdotes, while never losing focus on the main theme of the chapter. She keeps an even tone as a historian, addressing medical moral issues throughout history; she proposes a simple moral interpretation of the material, instead encouraging the reader to reflect on the topics and how they relate to modern medical practice.
Some of the more interesting and useful elements of the book are the Appendices: A) Recipients of the Nobel Prize in Physiology or Medicine (1901-1998); B) Resources and Research Tools; C) Educational Objectives (by Chapter). While these are most useful for students of history or medicine, they are interesting for the casual reader as well. I especially like the Education Objectives, as they summarize the key ideas of the text, showing the Duffin's purpose really is to clarify ideas with this ideal educational tool.