Amazon Prime viewers are discovering a hidden war film that needs to be seen. A Call to Spy, released in 2019, tells the story of Winston Churchill's Special Operations Executive - the SOE.

The film unveils the secret exploits of a group of heroic women, trained as spies during World War II, who played a critical role in the conflict against the Nazis. With minimal preparation and enormous pressure riding on them, these newly initiated covert operatives were relied on to help beat the enemy.

The story is told through the perspective of "spymistress" Vera Atkins, a real-life German-Jewish Romanian, who was part of the team who evacuated Poland's Enigma code breakers.

Portrayed by Stana Katić, Vera's journey is documented from how she was inducted into the SEO and how she helped the British and their allies undermine the Nazi regime in France, with some help.

Vera recruits two unusual candidates, Virginia Hall (Sarah Megan Thomas), an ambitious American with a wooden leg, and Noor Inayat Khan (Radhika Apte), an Indian Muslim pacifist.

The cast also features Linus Roache as Maurice Buckmaster, an intelligence officer who aided the women in the group.

The synopsis reads: "During World War II, the British prime minister instates a spy agency to undermine the Nazis. In a desperate attempt to gain leverage, they hire women as spies, who leave a powerful legacy behind."

Fans have expressed their admiration for the film on X, branding it a "masterpiece" that must be watched.

One wrote: "A Call To Spy on Amazon Prime is worth a watch. Splendid Plot & Acting by the actresses. Based on a true story of an American, differently abled citizen (including Radhika Apte) turned spy, sent by Churchill and saved France from Hitler's atrocities."

"A Call To Spy is such a masterpiece!," declared a second.

A Call to Spy That movie is brilliant and I can’t wait to rewatch it again! Uhhh and it makes it way easier to annoy and convince my friends to watch this masterpiece," penned another viewer as a fourth echoed: " A call to spy on amazon prime - must watch

Another chimed in: "A call to spy on amazon prime - must watch," as someone else agreed: "Just finished watching A Call To Spy on Amazon about the women of the SOE, well worth watching, really enjoyed it."

Speaking exclusively to Express.co.uk in 2020, Linus praised the real-life women in the SOE in the 1930s. With sincere admiration, he commented: "We've all heard the stories about the male heroes - but we've not heard much about these women who put themselves directly on the line without much training."