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.

In post-World War II Hollywood, an ambitious group of aspiring actors and filmmakers will do almost anything to make their showbiz dreams come true.

In 1843, despite the fact that Dickens is a successful writer, the failure of his latest book puts his career at a crossroads, until the moment when, struggling with inspiration and confronting reality with his childhood memories, a new character is born in the depths of his troubled mind; an old, lonely, embittered man, so vivid, so human, that a whole world grows around him, a story so inspiring that changed the meaning of Christmas forever.