When Mary Margaret and David’s affair comes out, Kathryn leaves him, but she disappears on her way out of town. Evidence begins to pile up that Kathryn was murdered, and it all points to Mary Margaret. The whole town turns against her and even David begins to believe she may have done it. Only Emma and Henry stay resolute in their faith in her, but Emma’s constant attempts to prove her innocence are always fruitless. But the morning that Mary Margaret is set to be taken off to trial, Kathryn suddenly appears. New evidence begins to pile up, this time against Regina—who orchestrated the whole plot to get back at her nemesis, Snow White—and her crony Sidney Glass (The Magic Mirror). Mary Margaret is free.