Clarke's attempts to foster a fragile peace are dashed by a new threat. Meanwhile, Raven becomes a target, and Murphy is running a highly dangerous con.
Clarke and her friends struggle to make a decision on how to proceed after learning about the terrible fate that awaits the world, and the people of Polis mourn their dead.
As tensions rise in Arkadia and Polis, Jaha leads Clarke and Bellamy down a road toward possible salvation.
Clarke’s arrival on the island quickly takes a turn for the worse. Meanwhile, Bellamy tries to avoid further tragedy in Arkadia.
Octavia leads her people toward Shallow Valley against the advice of Clarke and Bellamy. Elsewhere, Kane and Abby adjust to a new set of challenges.