The Land of Stories by Chris Colfer
This is the best book ever! It's about a brother, Conner, and a sister, Alex, who are twins and fall into the fairy tale world. They meet someone who tells them about a spell where you can make one wish called The Wishing Spell. They go on amazing adventures and see all the fairy tale world. The spell can only be used once more, and someone else is also looking for it, and you also figure something out about their dad that is very surprising. I really recommend this book!!