In 1943, two British intelligence officers concoct Operation Mincemeat, wherein their plan to drop a corpse with false papers off the coast of Spain would fool Nazi spies into believing the Allied forces were planning to attack by way of Greece rather than Sicily.
During the Blitz of World War II, a female screenwriter (Gemma Arterton) works on a film celebrating England's resilience as a way to buoy a weary populace's spirits. Her efforts to dramatise the true story of two sisters (Lily Knight and Francesca Knight) who undertook their own maritime mission to rescue wounded soldiers are met with mixed feelings by a dismissive all-male staff.