As World War II entered its most critical moment, the British Special Operations Group needed a group of female agents to complete a mission to rescue a geologist trapped in a German military hospital in Normandy. This geologist was injured while carrying out a reconnaissance mission on the terrain of Normandy and was mistakenly treated as a French surrendering soldier by the Germans.
The head of the British Special Operations Group, Beck, appointed Louis as the captain for this mission. Louis was a trained sniper who had witnessed her husband, a resistance leader, being brutally killed. She fled alone to London and was determined to dedicate herself to the cause of resisting the German Nazis. Despite strong opposition from her brother Pierre, also a member of the British Special Operations Group, Louis accepted the task and formed a team that included Jeanne, a prostitute imprisoned for murder; Cara, a young explosives expert; Susie, a cabaret singer and former lover of German senior officer Colonel Heindrick; and Maria, an Italian countess skilled in intelligence transmission.
Under Pierre's leadership, the all-female special operations team successfully infiltrated the German hospital in Normandy and rescued the geologist. However, their mission wasn't over. The Allies' plan to land in Normandy had been discovered by Colonel Heindrick, who intended to report it to his superiors. To prevent high-ranking German officials from learning about the Normandy landing plan, the British Special Operations Group tasked the women with eliminating Colonel Heindrick. However, believing they had completed their mission after rescuing the geologist, the five members were initially unwilling to carry out this new assignment due to various personal reasons.
At this point, Pierre was captured by the Germans. With the situation dire, the women's special operations team took on the dangerous task of traveling to Paris to protect the D-Day operation and eliminate Colonel Heindrick, the senior official of the German counter-espionage intelligence department. During this perilous mission, the five endured numerous hardships, using every ounce of strength and even paying the ultimate price.
Cara was captured at the train station upon entering Paris and was used by Heindrick to lure the other members of the women's special operations team into a trap at the subway station. Maria attempted to assassinate Colonel Heindrick but failed and was killed on the spot. Despite this setback, Louis was captured by the Germans. Unable to face the reality of betraying her country and comrades, Cara committed suicide by poisoning herself.
With both Cara and Louis captured, Susie decided to use herself as bait to lure her old lover, Colonel Heindrick. Just as she was about to succeed, she was recognized by Heindrick, who threatened Pierre with Louis's life to force him to reveal the reason for the geologist's reconnaissance in Normandy. Under duress, Pierre revealed the Normandy landing plan and then took his own life by committing suicide in the German prison. Jeanne managed to rescue Louis.
At the eastern platform of the Paris train station, Colonel Heindrick was preparing to board a train to Ulm to report the Allies' Normandy landing plan to his superior. Louis and Jeanne appeared to ensure the secrecy of the Allies' plan and carried out another assassination attempt on Heindrick. In a fierce battle, Jeanne sacrificed herself to cover Louis, who was eventually captured by the Germans. At the last moment, Louis confronted Heindrick, pointing a gun at his head.
In the end, the Allied landing succeeded, and World War II ended in victory. In a church, Louis lit four candles to convey this news and blessings to the four sisters who sacrificed themselves for this operation.