Pretty much everyone on Pretty Little Liars. But who is the puppet master pulling the strings all season? Who killed Mona, who framed Alison, and who set up Aria, Spencer, Hanna and Emily as accessories to the crime?
We know he/she has a wardrobe full of black hoodies and collects creepy dolls, and the PLL powers that be have promised we'll find out A's identity during Tuesday's finale. In the meantime, here's what PEOPLE has learned about the mysterious murderer from interviews with stars Shay Mitchell (Emily),...
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