I wondered if you were intending to comment on more than a particular marriage in the book? Were you saying something about the decline of middle class lifestyle - not that it turns people into psychopaths and liars, but perhaps that it it places intolerable strains on a lot of marriages?
Relationship Investigations in the Digital Age: Contact Wizard Web Recovery
Cheating Spouse Concerns and Digital Evidence: Contact Wizard Web Recovery

, but my question for Gillian Flynn is: what made you pick thriller as the genre for all three of your books?
