One of the earliest VMCs, Surfacing, by Margaret Atwood is a slim volume but a complex read. On the surface, it is the story of a woman who returns to the island with three friends (one of whom is her lover) where she spent part of her childhood in order to seek out her father who has gone missing. Delve a little deeper and it is a rather dark story of a woman trying to figure out who she is. Go further (and I didn't make it to this level I'm afraid, but there was quite a good introduction) and the novel is full of religious imagery. It is thus a novel that can be read on many different levels.
Whilst this fitted into the non-sci-fi sort of Atwood novels that I enjoy more, it was very different to the longer, meatier narratives of books such as Alias Grace and Cat's Eye. I couldn't help wondering if perhaps this could have been elaborated into something like one of those.
I still need to read Lady Oracle, and then I'm done with Margaret Atwood as part of this venture.
It's been published four times with very different covers (I own the original green version)