I just saw the 2017 BBC miniseries based on the book, and it’s pretty good.
There are some significant differences between the book and the show. Although it’s been a few years since I last read the book, off the top of my head:
[spoiler]The show, unlike the book, opens with the murder by a British Resistance member of a Luftwaffe ace who lands a captured Spitfire on the Mall in front of the bombed-out Buckingham Palace.
Supt. Archer and his lover and coworker Sylvia have an assignation in a Nazi luxury suite. Sylvia’s role is much bigger than I remember from the book, including her direct involvement in taking the ailing King George VI to the German atomic research base at Bringle Sands for evacuation.
Archer’s colleague Harry isn’t secretly working with SS-Gruppenfuhrer Kellerman to protect Archer.
There’s much more focus on the risks Archer takes in being targeted by the Resistance as a collaborator, including a murder attempt against him in the Underground.
SS-Standartenfuhrer Huth is younger and a bit more aggressive than I recall him being in the book. (His name is pronounced “Hoot,” which I didn’t realize before hearing it spoken; it sounds a little funny to my American ears for such a serious character).
Barbara Barga, the American reporter who has an affair with Archer, is directly threatened by Kellerman with torture, but is released to U.S. Embassy staff and survives at the end.
The King is killed by German machine-gun fire in a car in Bringle Sands along with Sylvia, not while being carried by U.S. soldiers on a stretcher towards an evacuation point.
Harry is last seen in Resistance hands, recovering from a bullet wound in the leg he suffered during the attempt to get the King out of the country.
Archer is not still working for Kellerman at Scotland Yard at the end, but is last seen on the run with (maybe) the invaluable microfilm of A-bomb research.
I was reminded anew of just how unlikely Huth would be to make Archer his confidante and aide, as Archer was a Brit who had lost his wife during the Blitz, and his loyalty would naturally be suspect.
Still an interesting tale.