An "A" For Our Favorite PLL English Teacher, Ezra Fitz: Based on PLL 4x14, Who's In The Box?
This is a theory based on the conversation Mona and Ezra had in Pretty Little Liars, Episode 4x14, "Who's In The Box?". It supports an idea that I've believed for a very long time now: that Mona and Alison are secretly working together. I compiled my reasons for this and made a separate post. Please check it out here! The following theory will explain why I think Mona's conversation with Ezra could have been a hint that Mona IS working with Alison and that she believes that Ezra is "the one Alison fears the most." Read on to see why Mona's anger that the girls are shutting her out could have led to her seeking out answers on her own, and how that could have led to her suspicions of Ezra.