It centres on the true story of James Stagg and the weather forecasts that determined the date of the D-Day landings as part of Operation Overlord.

[3] Recognizing the notoriously dangerous conditions of the English channel, General Eisenhower employs two meteorologists to advise him on which date would be best to launch the invasion.

[4] Despite a prolonged heat wave, Stagg is convinced that the weather conditions will suddenly deteriorate sharply on June 5, the current date of the proposed D-Day, and that the planned invasion should therefore be postponed.

Haig worked with director John Dove to research the story of Scottish meteorologist James Stagg, and his weather forecasting leading up to D-Day.

Reviewing the play for The Observer, Clare Brennan wrote that it was an "intricate and well-crafted drama" that addressed our emotions, beliefs, and judgements, and the role of nature in our lives.

"[25] In a positive review, Josie Balfour in the Edinburgh Evening News wrote, "Haig's script quickly sets up the story and plunges into a fast paced, confident stride, pausing only briefly before an almighty storm.

"[26] In a mixed review, Alan Radcliffe of The Times felt that the show moved at "an urgent pace" but had an "overly long closing chapter.

[31] Reviewing the West End production for The Guardian, Michael Billington praised the attention to detail, the show's nuance, and the ability to create tension and suspense, even though the outcome was apparent.

[32] Douglas Mayo, of BritishTheatre.com, praised Sinclair's "brash and commanding" performance as General Eisenhower, and described the scenes between Stagg and Krick as "electric".

Martin Morrow of The Globe and Mail gave a positive review of the show, writing that it was an "...intense but frequently entertaining history lesson."

[38] In a more mixed review, Joshua Chong of Next Magazine commented that the play felt formulaic and that the portrayal of Irving P. Krick as a "stereotypical macho American" was lacking.

[39] In July 2024, it was announced that the play was being adapted into a film, which will star Brendan Fraser as General Eisenhower and Andrew Scott as James Stagg.