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I really enjoy this series! I read it to my brothers and they beg me to continue when its time to stop. The only thing that bothers me about this series is the sneaky (and completely unnecessary) sexual content. Nothing horrid, but enough to make me purposefully skip certain sentences. For instance, one character's governess flirts and possibly has a sexual relationship with one of the villains (implied), and the mermaids look like naked women from the waist up (they have long hair that supposedly covers them). Some other stuff I didn't think necessary to skip: a mermaid saves Peter from drowning and gives him CPR and in his dazed state he thinks its a kiss (pretty silly actually)- a pirate captain has a special sail made that is shaped like a corset (image included in the book).
I definitely recommend this series, but read it yourself first, so you can choose to skip stuff or not. The bad guys are bad, the good guys are good, but nobody's perfect, even the heroes.