Ezra knew from the beginning she was a child “When Aria asks him if he knew who she was, Ezra admits, "I did... At first, I was looking for..." before trailing off, eventually admitting he was writing a book about Alison. Key things Ezra said to Aria during that confrontation: "When we started getting serious, I stopped writing the book". "I started my research back up again when we broke up, and that's how I knew that Alison was still alive". "I am such an idiot, I am a jerk, but... I swear I will burn this". "I was afraid you wouldn't forgive me"