Very pleasant book on class, ecology, and the combinations thereof. The heroine, trapped in both poverty and unwanted marriage, encounters an odd migrational behaviour of monarch butterflies and the problems of ecological disbalancing, gets involved in research and ends up leaving her husband and going to college. The framework is somewhat banal by now, but the book is much better than this. The description of the small Tennessee community to which the heroine belongs is probably the best thing about the book as well as the heroine's dealing with her class identity.