Justine Silver has decided to give up Judaism for Lent. That's because she's decided to become a Catholic, especially since her best friend is Catholic. But then she starts thinking about her family, and especially about her Grandmother, and realizes that there's a lot more to her faith than a particular name for G-d and a set of rituals. But all this understanding doesn't answer her questions. Instead, it makes her want to know more.
While this sort of story (teen seeking God) has been done before, it is not actually that common of a storyline. For that reason, readers might like the book. It also does a nice job of explaining Judaism to both the neophytes and those with some knowledge. Whether that makes it a good book remains a bit of an open question. What is more likely to make the book appealing is the nice characterizations and a genuinely interesting storyline. Problems are encountered and resolved, not always perfectly. And that always make a book a good read. Not a fantastic read, but certainly something worthwhile.