Isle of the Lost by Melissa De La Cruz

All the evil ones of Disney are regulated to a single island, where no magic is possible.  That seems fair, except these evil doers have families that are also punished because they are the children of evil.  If you want some bad chaps, put all the bad chaps in one place, nothing good will come of it, or will it?
Basic Disney fair with a little twist and a big moral tale.  Will really appeal to the younger middle school reader.

Kingdom Keepers Disney After Dark by Ridley Pearson

Using Daylight Hologram Imaging five middle school students are virtual Disney host.  When things get strange is when their dreams start seeming real, then they discover they are real, they are able to be in the park after they fall asleep.

As everyone knows Disney is full of magic and all magic has two sides. The DHIs have been created to help solve a mystery and to fight off evil. 

A really fun story, fast paced without being pushed, and quick chapters to encourage a reluctant reader.

It will also make you want to go to Disney.  I went when I was very young and was not impressed but this may make me give it another chance.