On Spencer's computer was a picture of Alison the night she went missing, with a message from A.

"Watch your backs. I didn't, A." Hanna read from the screen, "That was taken the night she disappeared. She's wearing the yellow top."

"Look." Sadie points to the screen, "There's a shadow right there like someone was following her. Spence, you know who that is?"

"I have no idea."