My dearest, It's one of the last memories I have of you, your arms clinging to her neckline, the gentle curve of her breast pressing into your skin through the thin cotton of a wispy white blouse,... A kiss... in the living room of a home I was meant to share with you. I have to know: Did you see me? Were you trying to make me mad? All my love, EV
Esther's room is a mess and it appears that she left through the fire escape because the window is open. Quinn does not understand because it is not like Esther to just leave, especially out of the fire escape. The book is focusing on the fact that Esther usually does not do things like this and how weird it is..
Quinn finds a note on Esther's desk that appears to have been meant to be mailed. It makes Quinn wonder if she really knows her roommate as well as she thought she did. This note further proves that Esther has a secret.
Alex sees a strange girl in the diner that does not usually come. She is staring out of the window at the house across the street. This shows that this girl is most likely Esther and that the house she is staring at may have something to do with her secret.
When Quinn first started living with Esther she found a photograph that was ripped in her closet. The half was only of Esther. This, once again, shows how mysterious Esther is and how much Quinn really does not know how her.
Alex is watching the girl who was in the diner swing. She is just sitting there in the rain like it does not even bother her. This scene is very mysterious because a normal person would not just sit in the swing by the lake in the pouring rain.
Alex watches as the girl strips and walks into the freezing cold lake. This shows that there is something definitely off about this girl.