Are you talking about the handbook for the tarot deck or the storybook she also released? My deck came with the guidebook, which is super useful, though I still check other guides for overall meanings sometimes. One thing I like about this guidebook is that it includes reversed meanings — something not all decks do (like the Wild Unknown, for example).
The storybook, Beneath the Moon, is lovely. I haven’t read it all yet, but I can’t wait to read it to my baby when he’s older and won’t try to rip all my books apart. It has the full stories that inspired each of the tarot illustrations, which is really nice.