The return of Ernst to Caroline's books, and she basically just ignores the previous mystery. While I don't love sending Caroline back to her cousin's farm, it makes more sense than the stagecoach journey had, and centering the mystery around smuggling sticks more closely to the War of 1812 theme. Caroline starts out pretty black and white: smuggling is evil and smugglers are evil. By the end of the book, she's learned that it's not so simple. Top that off with a slightly open ending, and this is a little more sophisticated than the average AG mystery. Sure, the smugglers get punished, but there's more than one motive at work and different levels of sympathy for their choices.