Erin Yeager and several of the 104th Training Corps have only just started to become full members of the Survey Division. While they prepare to confront the Titans again, their plans are disrupted by Wall Rose"s assault—yet things are not as they appear, and further enigmas surface. As the Survey Division rushes to defend the wall, they learn more about the attacking Titans and the hidden truths of their own comrades in their ranks, deeply hidden.
