The Strange Case of Origami Yoda by Tom Angleberger
This is the first in a series of books about a boy called Dwight, who has a little trouble making friends and who makes an origami Yoda finger puppet that hands out (surprisingly accurate) advice to his class-mates. This helps him develop friendships and build a circle of friends. It's a great story overall but will go down especially well with kids who relate Dwight's struggles (that'll be a lot of kids, we all worry about making friends at some point). The books in this series are also designed to be really readable with heaps of illustrations and doodles to liven up the pages for children who might ordinarily struggle a bit with 'normal' chapter books.