Authorities arrive, and it is discovered that Mona survived the fall. Dr. Sullivan diagnoses Mona with a personality disorder, and she is sent to a mental institution, Radley Sanitarium.
Mona reveals she became "A" to take revenge on the girls for "stealing" Hanna's friendship from her. [S2E25] Unmasked
Mona tricks Spencer into going to a cliff-side "A's" lair (near a hotel area). Mona tries to force Spencer to join her "A Team," and when Spencer refuses, a struggle ensues. Authorities arrive, and it is discovered that Mona
The episode centers on the Liars (Aria, Emily, Hanna, and Spencer) learning the true identity of the main tormentor, "A." It is revealed that Mona Vanderwaal is A. Mona reveals she became "A" to take revenge
The episode is renowned for its high-stakes tension and the "action-packed" nature of the reveal, marking a major turning point in the story.