'Once Upon a Time' Episode 16 Photos: Mary Margaret in Jail in 'Heart of Darkness'
When Mary Margaret is arrested for Kathryn's murder, she hires Mr. Gold as her attorney. Check out this slideshow to see the prisoner and lawyer at the Storybrooke jail. And click here for more "Heart of Darkness" photos
. "Heart of Darkness" will air on Sunday, March 18 at 8pm on ABC.