Review of 'Gone Girl'

Funny how there is so much less to write about with a good film than a bad one. This is a closely plotted psychological thriller with a possible murder and a missing person. There are two major plot twists, neither of which I saw coming, so good value there. It’s plot driven, but the characters are good and there are lots of nice details, like the media satire and the celebrity murder lawyer. I’ve always liked Rosamund Pike, so that’s another plus. I can’t see how I can say much else without this being a spoiler; this is good and worth watching.

OK, that said, now a SPOILER ALERT; don’t read further if you want to see this and enjoy it properly.

There is one plot/character hole that bothers me. It seems that Amy plans to complete her frame-up of her husband by killing herself. We ‘see’ her minds-eye view of the body drifting in the Mississippi, and she has a note on her meticulous planning calendar that says ‘Kill Self’. But this does seem rather out of character for her. She is a self-centred psychopathic bitch, and she has everything else worked out. So does she have a scenario where she lives on after her husband is executed for her murder? If so, I didn’t catch it. When she goes into hiding she takes a wodge of cash, but it’s not that much. But when she is forced to change her plan because she is robbed, she doesn’t bring forward the self-topping but instead looks up old flame/victim Collings. Also, the note on the calendar to kill herself doesn't appear to be the last item.

Maybe this is much clearer in the book. Can anyone who has read it, or watched the film more carefully, please explain?