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Love the change in setting and the adventure! It is, of course, a book of its time, so the treatment of some characters and some of the language is not what we would want to see today–good fodder for discussion, though, if you're reading this with someone younger.

Aside from that, my only complaint was [slightly spoilery] it was that the mystery itself was pretty linear (unlike the previous books which had pretty substantial twists). The more rewarding mystery was the secondary plot regarding some historical treasure. I am a sucker for a hidden treasure, though, so that's not really much of a complaint! ;)