I re-read GG not long ago and enjoyed it much more than I had remembered. It is definitely a dark book but not because of the taboo scenario. Much like Cujo and Rose Madder there are dark undertones in the everyday lives of the characters. By far the best written and creepiest part of the book was the eclipse scene with her father. The wife also has a weird lack of emotion and resentment toward her dead husband. Things went off the rails a bit at the end but I don't want to spoil that.
collector of bones