Lea Ok, no isbn. That's not good on a current book. My hunch, based on what I've seen in the past, is that Gustavo will return this book to the Step 1 page in hopes that someone somewhere can clear things up. Generally, this is difficult to do; and I, in the past, have run into brick walls working with 2 such books. If you are lucky, the administrator my consider the supplied info sufficient; my gut says otherwise based on what you've supplied.