Good versus Evil

The primary plot throughout the entire novel is that of good versus evil. In the first half of the novel, Nick represents evil and Amy represents good. As Amy recounts events in her diary, she is painting Nick as a selfish man that is trying to push her away.

Amy even implies that she thinks Nick might try to kill her and that she is very afraid of him. In the same Diary entries, Amy creates a persona where she is a very loving wife trying to turn her failing marriage around. In the second half of the novel, Amy reveals her true personality.

She is actually conniving and manipulative. She admits that she is the one responsible for staging her own disappearance and death. She also admits to setting Nick up to take the fall for her disappearance and murder. In reality, Amy represents evil...