With everyone still recovering from the unexpected attack on Nina Sharp, and the return of bio-terrorist David Robert Jones, Fringe Division puts all their efforts into locating William Bell for questioning, whom they believe to be responsible for all the recent fringe events. Meanwhile, accompanied by The Observer, Walter embarks on a mission of his own in an effort to discover important memories that he has lost. As the mysterious events of The Pattern continue to unfold, questions are answered, observations are made, and loyalties are tested to their breaking point.