Tensions mount for beleaguered British Prime Minister Winston Churchill as D-Day nears in June 1944. Fearful of repeating past mistakes, Churchill is reluctant to embark on the large-scale campaign that the entire war effort hinges upon. Clashing with his political opponents, the troubled leader receives unwavering support from his devoted wife, Clementine. With strength and shrewdness, she tries to prevent his physical, mental and spiritual collapse while inspiring him to achieve greatness.
With close to a million Allied soldiers poised to invade Nazi-occupied Europe via the beaches of Normandy, France, the film finds a deeply conflicted Churchill at odds with U.S. Gen. Dwight Eisenhower and English Field Marshal Bernard Law Montgomery. Ultimately, Churchill must pull himself together to present a galvanizing D-Day address to his country.