Snowpiercer, the great ark train, circles a frozen earth keeping humanity's last survivors until a murder onboard threatens the established order.
Layton investigates the murder while gathering intel for his revolution. Melanie faces a resource crisis that could impact everyone.
Layton descends into the black market, while Melanie stages a prize fight to defuse class tension.
A twist in the murder investigation brings Layton face to face with the murderer, and dangerously close to Melanie's secret.
Tension between Third Class and First Class comes to a head at the trial of the Snowpiercer killer.
Layton lays track for revolution while Melanie faces an engineering emergency that threatens every soul on Snowpiercer.
Melanie intensifies her search for Layton as he plots to weaponize her secret.
Revolution has finally come. As Layton leads the lower classes forward in armed rebellion, Melanie's house of cards collapses.
The rebel forces are on their heels when a dangerous foe joins them. A plan is hatched to take the train, but it may destroy them all.
In the revolution's aftermath, Layton and Melanie realize the greatest threat to their survival is right over their shoulder.
