This film is overlong - it is also rather confusing. I'd suggest adding LONDON or WARSAW or ITALY or whatever on the screen in a caption when location changes.
I found some of it confusing, esp with the female characters. Subtitles were prone to error too.
However, it is worth watching, together with various BATTLE FOR WARSAW Polish films.
The Winston Churchill here is possibly the worst fictional portrayal I have ever seen, however. It is a Polish film and so there is a fair bit of Brit-blaming - but in reality, no way could Britain or the allies stop Stalin's USSR in Poland.
Interesting film about the Jan Nowak, an emissary between Poland's Home Army in Poland and the Polish Government in exile in London and the skulduggery that was going on behind the scenes to keep Stalin on board to defeat Hitler. A very marked man by the AXIS powers and hunted relentlessly the film captures a period of his life when he was focused on liberating Poland to be a sovereign state and not become as it did a satellite of Stalin's USSR!