My reading class started the book Matilda by Roald Dahl last week. Matilda is a great book for elementary kids because of fantastic plot (Matilda has super powers!), the great English language (Roald Dahl was from England), and the silly pranks that Matilda plays.
There are a lot of chances to discuss vocabulary, plot, characters, and relationships. There are also a lot of great writing opportunities presented. For example, my students wrote about the best practical joke they have played on someone.