In the seventy two hours leading up to D-Day, all the pieces are in place except for one key element, the British weather.
Britain's chief meteorological officer James Stagg (Andrew Scott) is called upon to deliver the most consequential forecast in history.
The wrong conditions could ruin the largest ever seaborne invasion, however any delays waiting for weather risk German intelligence catching on.
Haunted by a catastrophic D-Day rehearsal, the final decision rests with Supreme Allied Commander Dwight D. Eisenhower (Brendan Fraser).
With only hours to go, the fate of the war and the lives of millions hang in the balance.
L-R: Andrew Scott, Brendan Fraser, Kerry Condon, Chris Messina and Damian Lewis:
Getty/Chad Griffith/Courtesy/Getty/Clint Spaulding