What Was She Thinking?: Notes on a Scandal by Zoe Heller. This book is a
fictional scandal where a high school teacher has an affair with a student,
as documented through the eyes of another teacher, who identifies herself as
the woman's best friend. What is fascinating about the book is that it has
the most unreliable narrator I've ever read, so it doesn't tell us as much
about the teacher who's having the affair as it does about the narrator.
It's all very psychological and handles the squicky subject matter with
excellent discretion. Worth reading even if just to appreciate the literary
devices.