It's 1958 when the Miller family moves to Havana, where 18-year-old Katy's (Romola Garai) parents expect her to be the belle of the high-society ball. Instead, she falls for Xavier (Diego Luna), a waiter who teaches her how to dance and partners with her for an upcoming contest. But Fidel Castro's rise to power forces Americans to depart, putting Katy and Xavier's relationship in jeopardy.