The films of Anna Neagle and her director/husband Herbert Wilcox haven't aged well, but this is an exception. It's a faithful biopic about Odette Sansom, a Frenchwoman who spied for the British in WWII, then survived Ravensbrück concentration camp. She was awarded the George Cross and Legion d"Honneur
It follows the standard special operations model , but surprisingly the events are hardly embellished, partly due to the influence of Odette herself. This means the narrative feels undeveloped, but leaves an impression of authenticity. Especially with the use of genuine locations.
This is the role of Neagle's life, and despite her limitations, she gives it a fair shot. Trevor Howard is a natural with the brittle dialogue and maybe upstages her as the British liaison with the Resistance, who Odette married (and divorced) in peacetime. But the romance is only incidental.
Odette is portrayed as an average woman made heroic by extraordinary times. By 1950, there had already been films made from the files of the SOE, but this was new because it is about real, named people and verifiable incidents. And it is a moving and humbling experience..