A Reliable Wife by Robert Goolrick
http://www.readinggroupguides.com/guides_r/a_reliable_wife1.asp
I really don't think this book deserved all the high praise it has received, but I do think it has some lessons to teach:
1. Be careful when choosing friends and lovers. They may not be all they appear to be. Or they may be ever so much more!
2. What goes around, comes around.