This is the only book you'll need in the Camnino. It's much lighter to carry than the author's Pilgrim's Guide which, frankly, contains too much waffle (such as his "spiritual reflections"). This pared down version is basically just the maps and a very brief overview of the route. You don't want anything else.
Excellent and realistic maps which are helpful in understanding the type of terrain to be crossed (lots of steep hills) so that you can make realistic decisions as to how far you are likely to get each day.