As the bomber is revealed, Layton comes to terms with his past decisions before making an irreversible call.

Mr. Wilford arrives and threatens Snowpiercer, so Melanie makes a move that can’t be undone.

In the revolution’s aftermath, Layton and Melanie realize the greatest threat to their survival is right over their shoulder.

Revolution has finally come. As Layton leads the lower classes forward in armed rebellion, Melanie’s house of cards collapses.