Catch Me If You Can

Dorcas Meadows seems like a mild manner witch who could no one any harm. Right? But what no one knows is she is actually an assassin for the other side. Will they find out in time? Or will she be able to finish her job without a hitch? Written for the Fortnightly Challenge Thread's Snape Appreciation Challenge on Hogwarts School of Witchcraft and Wizardry. I hope you all enjoy.