Kelly Masterson is an American playwright and screenwriter best known for writing Before the Devil Knows You're Dead and adapting the screenplay for Bong Joon-ho's Snowpiercer.
In a future where a failed global-warming experiment kills off most life on the planet, a class system evolves aboard the Snowpiercer; a train that travels around the globe via a perpetual-motion engine.
When two brothers organize the robbery of their parents' jewelry store, the job goes horribly wrong, triggering a series of events that send them and their family hurtling towards a shattering climax.
More than seven years after the world has become a frozen wasteland, the remnants of humanity inhabit a gigantic, perpetually-moving train that circles the globe as class warfare, social injustice and the politics of survival play out.