Erwin Smith: The 57th Exterior Scouting Mission, Part 4.With the Female Titan restrained, Erwin and Levi try to ascertain her identity with no success as she is able to crystallize her skin to prevent them from cutting out the human inside. Armin, Jean and the rest of Levi's squad realize it was Erwin's plan to use Eren as bait to draw out the mole within the army who joined them after the Walls fell and only revealed his plan to those who were part of the Scout Regiment before the fall. Meanwhile, the others wonder what is happening inside the forest....