actually 3+

Honestly, I don't remember much of the second installment; but, I remember not liking it as much as the first. I think this, the third, is slightly better again, though I wondered most of the way through when I would have liked to read this—maybe at age 6? So, it mightn't appeal to precocious readers. Given that it's targeted to middle-graders, there's nothing exceedingly sinister in the content.

As another reviewer has noted, the series probably appeals more to Hyde Parkers more than most, though this installment is set in England.