Operation Secret plot
During World War II, American Secret Service Lieutenant Peter Forrester joins the French Foreign Legion. With the assistance of the so-called nun Maria, Peter manages to extract secret documents from the Germans. While under attack by the Germans, Peter's division of the Foreign Legion led by Major Latrec discovers that they have a traitor in their midst who is supplying the Germans with information. When the resistance leader Marcel Brevoort is also murdered, Peter is blamed. During the trial, however, witnesses, including a Russian spy, make different statements. Will Peter have to give up his true military secret assignment to save his life?