It’s not that this book is bad—it is a recollection of a very specific time of a Swedish diplomat who did work with Raoul Wallenberg—but it is very limited in the history/biography aspect. If you’re looking for a study of Wallenberg, seek a different book. If you are looking to get your hands on any information possible, go ahead and read this.
This is a personal history of Budapest during the occupation and the Swedish role in saving thousands of Jews. It does not gloss over the complex political situation between the Hungarians, Germans and Russians.