This book follows up on the other books by the author, The Not so Big House, and Creating the Not so Big House. When published, those books created a sort of mini-revolution in the "bigger is better approach" to homes.
This book follows up to the original idea of a not so big house by offering attractive and functional details one can add to it.
There is nothing overtly wrong with this book, it is beautifully photographed, but I did not gain a whole lot from reading it. As the title indicates, it's about detail, the stuff that is extra to an already well built house, (ie built in bookshelves, window seats, etc.). Because the possibilities with detail are nearly endless, the author chooses some of her favorites and devotes the book to exploring them. If those details are exactly what you are looking for in your plans, this book is probably worthwhile, albeit pricey, but if the details are not suited to your lifestyle or aesthetic consider skipping it.