Summer Sisters by Judy Blume
I still remember when I was a young teenager (or maybe even preteen), and I read all of Judy Blume's young adult novels, and then my mom banned them all for the rest of the kids. I think she had already written her first “adult” novel, Wifey, by then, which I happened upon the other day. I read through the first few pages, and that was enough to confirm the rumors I heard long ago that it was a truly trashy book. Anyway, Summer Sisters is entertaining and well-written and has some good insights into relationships between friends and mothers and daughters. Sometimes it's quite poignant and moving. It also made me think I should never allow my children out of my sight, or more specifically, I shouldn't allow them to hang out at other people's houses for extended periods.