Theo leverages his status as the only surgeon in town to get answers about his wife and information from Jason Higgins. Meanwhile, Megan Fisher leads research being conducted on the Abbies.
Xander returns to Wayward Pines with someone to help him learn more about the Abbies. Meanwhile, Rebecca goes out of her way to help a girl trying to escape a town tradition and C.J. leads a group on an expedition.
Rebecca remembers meeting Pilcher as an architect. Meanwhile, Rebecca shares a shocking secret with Theo and Teresa tells C.J. and Adam she wants to live outside the walls.
As the Abbies being to overtake the town, Theo is faced with a decision that could seal the fate of humanity.
Theo and Hassler search for the escaped Abbie leader. Meanwhile, Jason receives devastating news and Xander talks to Rebecca about her condition.