In Rosewood, Pennsylvania, reporters are lined up outside the historic courthouse, typing furiously at their iPhones with freshly manicured nails. Because the trial of the century is happening right here in Rosewood: the four pretty little liars have been accused of killing Alison DiLaurentis.
They have lost everything. Hanna lost her movie deal and invitation to go to the Fashion Institute in New York. Spencer's bully blog has become a wasteland and her acceptance to Princeton revolved, Aria is no longer a sought after artist. They have gone through a feat of lawyers and none of them believe that Ali is alive or setting them up.
The girls then decided that they had to find a way to beat Ali at her own game. They knew that she was framing them for her "own murder" but they weren't quite sure how.
The girls went to Cape May following a lead on Ali but it was a dead end. They finally gave into their fate and gave up. They decided to just stay the night there not realizing that something was wrong with Emily. Emily had already tried to kill herself in the last book but she returned too this state of mind and tries to again.
Next thing you know they are all at Emily's funeral, Hannah is getting married, Spencer is back with Wren, and Aria and Noel come back to the states for Hannah's wedding. After a while Emily, who faked her death, found Ali and her mom way to easily. The cops then come and try to get Ali while she is trying to escape but she is unsuccessful and they get her.
Ali made herself seem insane so she can get thrown in a psych ward and learned from her mistakes of the past by counting on other people's help with her plans