The book description does a good job: This is, indeed, an examination of Art Nouveau tiles from all over Europe as well as the United States. The authors promise that it is "an essential volume for the collector and interior designer, featuring 200 stunning color photographs of these ceramic treasures." But I think it's a bit more than that.
The book is organized primarily by region. After a few chapters on "Arts & Crafts Inspirations" and "The Rise of Art Nouveau," chapters are dedicated to tiles from northern Europe, central Europe, southern extravaganza (e.g. Spain and Italy), new world experiments, then "Art Nouveau and Beyond." Finally there's a chapter full of advice about collecting Art Nouveau tiles.
First off: This is enjoyable on more than one level. If you're seriously into tiles and interior design, then obviously you'll be interested in the book for the history it imparts, as well as collecting info (such as the difficulty of dating tiles, and how to display a collection).
I comfortably admit that I merely skimmed the text, though, because for me this is a book full of OH PRETTY PICTURES. I've done quilting, as well as some stained glass and embroidery, so I could pretend that I'm getting design inspiration for these, but really it's just lovely to see lots of gorgeously photographed tiles from all over the world. (Gosh could I get quilting fabric inspired by the tiles by the Boulenger firm?)
Plus, since the book starts with a great examination of the influences of the A&C movement, among the OH PRETTYs are tiles from William Morris, Burnes-Jones, de Morgan, and other artists who usually get attention for their other creations. I think of A&C as kissing-cousins with Art Nouveau anyway, so some of the tiles in the other chapters could just as easily -- to my untrained eye -- fit into my design scheme.
If you care about this subject... don't resist. This is a lovely book.