An Unsatisfying Ending!

As mentioned a couple of weeks ago, I am enjoying the freedom to write what I like and read what I like since the completion of my thesis. Over the weekend I completed another novel, which I loved... and loathed!

I loved the journey "Gone Girl' took me on, and the changes in the way I felt about the characters as more information was divulged. A clever use of the diary format by the author to tell a different side to a story helped to develop the story and characters
But I felt completely jilted by the ending. I mean I love a good twist, but the way this book finished left me completely unsatisfied and with a bad taste in my mouth. I want to rewrite it the way it should be!