Agile doesn't mean blindly feeling around until you figure it out for yourself. It means using the best practices you find or invent to achieve the manifesto. If this book has some good insights, it's a worthwhile read.

Does it, though? I dunno. I didn't read it. When I see a book with words like 'ninja' and 'samurai' and it doesn't involve martial arts, I generally just ignore it because it seems childish.