2nd grade vol. The Great Piratical Rumbustification and the Librarian and the Robbers by Margaret Mahy. Illustrated by Quentin Blake. David R. Godine, 2001.
Second grade is a hard age to buy for.
You want to buy books they can read themselves, but you don't want the book to be too babyish, in format or in story. This one is a lot of fun. It contains two long stories. In the first, pirates get together to throw a party at the house of two little boys whose parents aren't home. The parents have unwittingly chosen a pirate as their babysitter.