Pretty Little Liars: What Does "A.D." Have to Do With Mary Drake and Dr. Rollins?

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Pretty Little Liars has roared into our lives with a seventh season, leaving us completely enthralled and begging for answers. In the wake of the premiere, it's abundantly clear that two dark forces are at work. On one hand, we have the seriously malicious "A.D.," who holds Hanna's safety as a collateral for information on Charlotte's death. On the other hand we have mysterious Mary Drake and her accomplice, Dr. Elliott Rollins. At this point, we can't help but wonder: are they one and the same? Keep reading to see how it all lines up.