This is one of those films where the story is worth knowing - these women really lived, they did these things and it's quite astounding how selfless & brave they were. A lot of people don't know about them; and here in 2020 when people with physical disabilities like a missing leg, or someone of mixed heritage who is a practicing Muslim can still be treated with suspicion, the fact these women voluntarily went undercover to help the Allies in WW2 is pretty darn special.
Unfortunately, the script is not great. There's something very TV movie about this film. It just doesn't have the polish in tone or look, script or cast.
It's by no means awful. It is just very average. Your elderly Mum might enjoy it with a glass of the House White, but it won't be winning any awards anytime soon.