In December 1935, when his train is stopped by deep snow, detective Hercule Poirot is called on to solve a murder that occurred in his car the night before.
After freeing a young Bedouin girl from her unjust imprisonment in Jerusalem, an Australian adventuress, together with her devoted police detective friend, begins to unravel a decade-old mystery concerning priceless emeralds, an ancient curse and the disappearance of the girl's mother and massacre of her tribe.
England, December 1926. Although her personal life is in tatters, the famous writer Agatha Christie decides to leave everything behind to help unravel an unsolved murder committed on a train six years ago, unable to imagine the disproportionate consequences that such a selfless act will cause.
Nancy becomes increasingly convinced she was kidnapped as a child. When she meets a couple whose daughter went missing thirty years ago, reasonable doubts give way to willful belief.
Romulus, a misunderstood musician turned recluse hiding from personal demons in a New York City cave, finds the frozen body of a young drifter in a tree. The authorities, including his police officer daughter, claim the death is accidental. Romulus is convinced the man was murdered by a prominent art photographer but how can he prove he's right when everyone thinks he's insane?