Why she might be "A": Alison (Sasha Pieterse) proved this week that she's still not above totally manipulating everyone around her — and she has the acting skills to pull it off. She seemed genuinely scared during the fake attack that she set up. If that was an act, it calls everything else we've seen from her into question, too.
Why she might not be "A": Well, she claims to be doing all of these bad things to help protect herself from "A". If that's a lie, why would she be doing them at all?
Why he might be "A": The more the clues point to everything that happened at Radley being key, the more we start to suspect Wren. We've always found his interest in the Liars suspicious; is he interested because he's after them? Is it because of things he learned at Radley? Is he the reason Eddie is gone?
Why he might not be "A": We still don't have a solid motive for him. He seems to be connected to some sort of cover up at Radley, but that still doesn't seem like enough to motivate him going after the Liars like "A" has.
Why she might be "A": Why was Melissa's helmet at the same barn Bethany Young used to go riding at? That's totally suspicious if you ask us.
Why she might not be "A": As Spencer pointed out, that could also be a false lead planted by "A". There are so many possibilities!
Who do you think "A" is? Let us know in the comments below!
Catch the next episode of Pretty Little Liars Season on Tuesday, August 5, 2014 at 8 p.m. ET on ABC Family.