Jacky's up to her normal self, again running into some important figures from history as she makes her way across what there is of the United States and down the Mississippi. Watching her get in and out of scrapes with the help of her friends is as exciting as the other books. Funny in spots, and definitely a little more grown-up than the first books of the series (though even those didn't shy away from some problems). 
 We also get to see a little more of Jaimy as he tails Jacky. I think he's growing up a bit, too. He certainly sees enough trouble along the way to wise him up. Part of my problem with Jacky/Jaimy is that Jaimy has always seemed so prudish while Jacky's so wild. They move a little closer here.