I have a lot of ground to cover with this one, so I'll try to make points quickly. Firstly, this may be my favorite Betsy book, completely because of the ending. Though I've always "liked" Betsy, I've often not liked her behavior as she focuses too much on being the center of attention and wanting beaus even when she isn't serious about the guy and has a guy she is serious about, but doesn't think about how she's hurting him when she's "just having a lark". Hence the argument with Joe, which is one of the most disconcerting parts of this story: the time jump. It's been two years since Betsy and Joe, we come back into the story after she's done a whole year at college, argued with Joe, got appendicitis which caused her to miss her sophomore year, spent it in California instead and is about to get on a steamer headed for Europe! Ms. Lovelace has done moderate time jumps before, but generally you could finish one book and pick up the next one starting a month or so later in the life of Betsy so the narrative flow doesn't really feel broken... until here. Which means it takes awhile for us to find out exactly what happened in those intervening two years and makes it very awkward when Betsy starts flirting with other guys as we readers are still like "BUT WHAT ABOUT JOE?!?!". I have to move on, but these were my two big issues with the story. The delightful parts were Betsy's new friends around the world, the many amazing places she gets to visit, how you see it growing her as an author (and how the advice "if you want to write, write every day, even if it's just a little bit" has been around for a long time!), when her flirting ways really get brought home to her and make her realize just how much she loves Joe and really hurt him and has now hurt someone else that she cares about; but the real moments of gold? When she casually reads about "some Archduke's assassination" while in Europe. If you are at all a student of history, you know the dominos are coming down and over time as the rumbles of war get louder, the conversations she has with people of "surely it won't come to real war!", "it'll only last a month", "the world is far too advanced to be pulled into a widescale war" and then while in England, the fateful declaration with Betsy knowing she has friends on both sides of this conflict. Thank heavens for Joe!
Content notes: No issues; drinking and smoking are mentioned, but drinking in moderation only and smoking is repeatedly mentioned being a dirty habit that nobody should take up; some kissing, but usually just on the hand or forehead. A lot of things are going on in the background that Betsy is too naïve to see fully, like her friend's alcoholic father (which is hinted that he's abusive) or when she's looking for passage home and her friend insists she only travel on an American ship (because British ships were in danger of being sunk after War was declared), so on the surface, this is probably as light a view of the time as you can get, but there are deep, dark waters just off shore if you look.