The Course of Love by Alain de Botton

Such an unusual novel: it reads rather like a single case study in social psychology or a fly on the wall television documentary, which sees a couple through stages in their relationship with a running commentary to consider what is going on at deeper levels.  It is wry, wise, funny and tender but also oddly objective and interpretative.  It is easy to forget that it is a novel.  It makes for interesting and entertaining reading.