Clarke, Bellamy, Octavia, and Jasper make their way back to Arkadia not knowing that Alie has been with them all along. After arriving at the camp, they lay out a plan to strike back and end Alie once and for all. While Raven and Monty try to hack into Alie, they get a surprise attack. After falling into a trap at the Capital, Alie captures Clarke and and her friend and tries to force Clarke to give the pass phrase to the flame. The situation takes a different turn when an unexpected ally shows up to help them.