A professional bodyguard must protect his longtime nemesis, a ruthless hit man, after the latter agrees to testify at the Hague against a dictator. The bickering pair team up to defeat the dictator's henchmen as they embark on a journey across Europe.
When his son dies while hiking the famed Camino de Santiago pilgrimage route in the Pyrenees, Tom flies to France to claim the remains. Looking for insights into his estranged child's life, he decides to complete the 500-mile mountain trek to Spain. Tom soon joins up with other travelers and realizes they're all searching for something.
Forced to take the intercontinental trip to Los Angeles by train, and determined to chronicle his adventure, disillusioned journalist Tom Langdon finds himself westbound with a variety of characters. While all passengers on the Christmas train appear to be headed for the same destination, Tom has no idea that the rugged locomotives taking him across America will instead detour straight into his heart.