When 29-year-old London stockbroker Nicholas Wintonvisits Czechoslovakia in 1938, just weeks after the Munich Agreement was signed, he encounters families in Prague who had fled the rise of the Nazis in Germany and Austria. They are living in poor conditions, with little or no shelter or food and in fear of the invasion of the Nazis. Winton is introduced to Doreen Warriner, head of the Prague office of the British Committee for Refugees from Czechoslovakia (BCRC). Horrified by the conditions in the refugee camps, Winton decides to save Jewish children himself. Actively supported by his mother Babette, herself a German-Jewish migrant who has since converted to the Church of England, he overcomes bureaucratic hurdles, collects donations and looks for foster families for the children brought to England. Many of them are Jews who are at imminent risk of deportation. A race against time begins as it is unclear how long the borders will remain open before a probable Nazi invasion.