Who Is "A" on Pretty Little Liars? Meet Our Top 12 Suspects

Why It's Possible:

• We know Shana's involved with Jenna and that it's even a little romantic.
• Remember the Summer finale, where we see Mona and Shana coconspiring? Pretty fishy.

Why It's Not Possible:

• There's not a lot of hard evidence to implicate that Shana's pulling the strings. Sure, she does shifty stuff with shifty people, but that's about all we've got.
• Shana says she's on Ali side, and she proves it when she shares things only Ali would know.
• Along the same vein, Shana admits being involved but claims she only did so to go undercover for Ali.