Overall it could have been good but instead just became annoyingly predictable
How is the plot?
Once the big reveal happened that Amy was framing her husband, the book became really predictable.  I thought the initial idea of the Amy diary was clever and how she framed him, but it left everything else lackluster and dragging on.  I never found myself rooting for any of the characters.  I felt the ending was flat and without any impact.  I would have ended it with someone dying or something.  Them continuing a fake relationship was not satisfying to me.  Overall it could have been good but instead just became annoyingly predictable. 