This is, by far, the biggest lie that the show has ever told. For four seasons, we were told Alison DiLaurentis was dead and in the ground, but instead, she's been alive, posing as a "good" version of Red Coat (CeCe Drake is the "evil" version) and apparently trying to escape someone who wants to hurt her. Is that "A"? It seems like it, but we don't know if Ali is telling the truth whatsoever — this could be one big, elaborate plan to fool the girls. And there's always that twin theory from the books . . .
Source: ABC Family