It makes for an interesting viewing experience because it highlights actual French resistance members, lending a sense of realism to their brave actions and demonstrating the significant collaboration with the Royal Air Force. Their methods in damaging the Nazi war effort during World War II were both bold and resourceful. The story centers on two individuals, "Felix" (Harry Rée) and "Cat" (Jacqueline Nearne), and explores how they were chosen, prepared, and employed in this highly confidential and perilous operation: disrupting enemy communications through surprisingly straightforward yet remarkably successful means. It feels more like a documentary than a traditional drama; the performances are understated, which actually enhances its believability, as it underscores the vital importance of their work. Running for just over an hour, it’s definitely worth checking out.

Source on TMDB