Pretty Little Liars book #6 Killer

Well this time these pretty little liars are all up to something different. Spencer went off to meet her New Yorker Mommy named Olivia Caldwell, she tries to squeeze out of her parents that she's adopted one last time but they just wouldn't come out with it. However as soon as they're dinner is over Olivia has to jet off to Paris for her honeymoon with her new husband. Aria moves in with her dad to avoid the large problem of her mother's new boyfriends. Since she's out of the house so much Ella begins to miss her, so she invites her to the grand opening of a new hotel where a piece of Ella's art is displayed. Soon Arias starts seeing Jason Diluarentis, and she finds out at the grand opening that Jason was once a patient at this former mental institution, with a little help from Emily of course. Emily, Emily, Emily. She loses her virginity to Issac, her new boyfriend. However when his strict mother finds out she threatens Emily telling her to never set foot in her home again. When she tell's Issac of this he doesn't believe her until he later finds a picture of them were Emily's head was cut out of the picture. When he apologizes to Emily she decides she doesn't want him anymore.  Hannah on the other hand is having a great time with her punishment with Kate. She has to go everywhere with Kate. Finally her Dad starts to let up on the punishment when she starts going on dates with Arias younger brother Mike. he has a different plan in mind, he wants either Hannah or Kate for his prom date. When all the LAX boys bet on who he can take and Hannah agrees to go if he won't invite Kate to the hotel opening then Hannah learns of the bet, however she agrees to go with him when he tells her he likes her better. Spencer want's to become closer to her real mommy so she buy's an apartment in New York hoping to get away from her "fake" family. She calls the realtor Olivia said could help her and gives him the number to her bank account holding all of her college funds so she can have the apartment of her dreams, and its only steps away from her real mommy's house. When she goes to see her new apartment she quickly learns there isn't one, and there is no Olivia Caldwell either, when she goes home she finds her bank account has been wiped clean. The others soon find out it was wilden and jason who killed Ali, with a confirmation from Ian, who wasn't dead in the woods and is still on the run from the cops. Emily and Hannah go to Spencer to tell her while Aria runs to get an old piece of the time capsule flag that was Ali's before she died. Ian warns them that Wilden may do something to hurt them because they know he did it, just as this is happening they begin to smell gasoline and know exactly whats going on, Aria smells the same thing to as she runs through the woods to get to Spencer's. on her way everything begins to go up in flames around her, she stops running as soon as she hears a cry for help from a dark figure. she helps the faceless person out and they both reach Spencer's safely just as the others are. There they all find that the dark figure has a familiar heart shaped face and beautiful voice, when they pull of they're hood they see to they're surprise it's none other than Ali. But the question is, was it really Ali, or was it something or someone else?