Nikki's guide to season 1 & 2 was a fantastic read and now with a separate book for season 3 she sticks very much to the same great formula.
Each episode has a quick run down of important points, interesting facts, co-incidences and highlights things that may have snuck under your radar. It also highlights where the numbers are used, translates Sun/Jin's Korean conversations that aren't subtitled, highlights production mishaps and inconsistencies. It's great to have a book that is both praising and showing niggles too.
The book also explains references to books, quotes and stories that are mentioned in show and explains other things such as The Lost Experience.
Nikki's informative, has opinions and has a very keen eye for detail and that's what makes this book such a great read. I've found myself now going back and watching season 3 looking out for things she's found and that's reason enough for the book alone.