After learning about the American Revolution on a family trip to Boston, Massachusetts, Judy Moody makes her own Declaration of Independence and tries to prove that she is responsible enough to have more freedom.

Third-grader Clementine's school field trip to Plimoth Plantation leads to all kind of discoveries, from fourth grade eating rules to the source of the stink on the bus.

After Dr. Dan comes up with a cure for flatness, Stanley, who is on vacation in Boston with his family, must decide whether or not to stay flat.