Hamburg, Germany, 1939. Getting a passage aboard the passenger liner St. Louis seems to be the last hope of salvation for more than nine hundred German Jews who, desperate to escape the atrocious persecution to which they are subjected by the Nazi regime, intend to emigrate to Cuba.

As the youngest of the family, Sam is haunted by the notion that someday he could become the last remaining survivor, all alone. On a family vacation at the beach, he meets the unconventional Tess, who carries her own secrets around with her and shows him how the present moment can win out over memories and anxiety about what’s yet to come.