** spoiler alert ** 
 The idea of a Puritan-era witch still wandering around a town locked in a Village-style existence, built around keeping her secret, is a marvelous idea and I loved the first half of this book. The gradual introduction of the situation, the town's secret government, the investigation by the teens... all of that was fun and fascinating. 
 What cost it two stars for me was the second half of the book. In a nutshell, it turned hard into very well-trod paths. At a certain point I began thinking, "This is going to be another 'Monsters are due on Maple Street'", and sadly, I was right. It was a great story when it was a Twilight Zone ep, but it's been done to death and ultimately, "Humans are their own worst enemies" has just gotten a bit boring to me as a central theme. I know that, I can read the news, I prefer something else from my horror. So... Well written, engaging premise, doesn't stick the landing.