[WARNING: The following story reveals the identity of Pretty Little Liars' A. Read at your own risk].

The mystery of A's identity in ABC Family's Pretty Little Liars has finally been revealed and ultimately mirrored the books on which the series is based.

In the Season 2 finale, Spencer, Hanna, Aria and Emily grew closer to uncovering A by discovering a seedy motel that Alison, their murdered friend, had visited. It was the group's brainiac Spencer who realized that A wasn't following Alison; instead, Alison was spying on A, whose lair was in Room 2 of the Lost Woods Resort. Spencer took Mona with her to sneak into the room. Upon opening up a diary that was bookmarked with a gum wrapper, Spencer figured out who exactly that wrapper belonged to ...

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