David suspects a traitor inside the complex helping the insurgents, and orders Pam to question the technicians. Meanwhile, Ethan is determined to stop more terrorist attacks like the one that put Ben in the hospital.

Harold's failed attempt to break past the fence surrounding Wayward Pines leads to questions from Ethan about other insurgents who have gone off the grid. Amy's health takes a turn for the worse. Nurse Pam pushes Theresa to investigate Plot 33. Ben is encouraged by his teacher to speak publicly about current events.

The electricity in Wayward Pines is turned off with deadly repercussions. As Ethan and Kate take the necessary steps to move everyone out of harm's way, Nurse Pam confronts Pilcher on his decision and tries to convince him to reconsider.