So, if you are looking for a book with a lot of detailed multiverse building, then [b:The Magician's Nephew|65605|The Magician's Nephew (Chronicles of Narnia, #6)|C.S. Lewis|https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1308814770l/65605._SY75_.jpg|1031537] is what does it for the The Chronicles of Narnia. The most interesting part of this one is the expansion of the character Jadis (the White Witch gets a name!), because she is a really winning villain in the greater fantasy lore as far as I am concerned. This novel is also interesting in that the Christian messaging becomes significantly stronger, especially by way of Genesis, so if that is something you would find entertaining, than I do recommend this book. And maybe an apple.