Winston Churchill faces immense pressure and self-doubt in the days leading up to D-Day in June 1944. As the Allied forces prepare for the largest military invasion in history, Churchill battles with his own fears and the haunting memory of past military failures, particularly during World War I. The prime minister is portrayed as a complex figure, caught between his duty to lead and his emotional turmoil. He vehemently opposes the planned Normandy invasion, fearing a catastrophic loss of life. This puts him at odds with U.S. General Dwight D. Eisenhower and British General Bernard Montgomery, who are determined to proceed with the operation as planned.

Churchill's internal conflict strains his relationships with key figures, including his wife Clementine, who provides both support and a dose of harsh reality. As he grapples with the weight of his responsibilities and the mounting pressure from his allies, Churchill's resolve and leadership qualities are tested to their limits. The narrative delves deeply into his personal struggles, offering a poignant portrayal of a leader at a critical juncture in history.