Nicholas, a Vermont Tale (Nicholas Northeastern Series)

After traveling across his home state of Massachusetts (Book One), Maine (Book Two), and New Hampshire (Book Three), Nicholas and his friend Edward the chipmunk cross into Vermont, still in pursuit of the family journal. The two creatures make new friend and learn a great deal about the state of Vermont. But will Nicholas ever find the family treasure and return home? Book Four in a four-book series about Nicholas's adventures in the Northeast.