The Rabbi and the Twenty-nine Witches by Marilyn Hirsch
I’ll be honest–this one scared me a little as a kid, but it scared me in a good way, the way ghost stories scared me. In this story, based on a Talmudic legend, a fearsome group of witches terrorizes a Jewish community every month on the full moon. The villagers fear they will simply never get to see a full moon, until an extremely clever rabbi figures out the witches’ fatal flaw and outwits them. Just be prepared to answer some questions about whether Jews believe in witches!