Americans abroad. Roy and Jessie finished a volunteer stint in China. He loves trains, so they go home via the Trans-Siberia Express. There are strains in the relationship, including her past. They meet Carlos, a Spaniard, traveling with Abby, a young American. Carlos keeps close to Jessie, and when Roy is left behind and waits a day for the next train so he can catch up, Jessie and Carlos take a trip into the dead of winter to photograph a ruined church. Carlos may be running drugs, so, later,...