The film is set in 1941 during the Second World War, when the city of Benghazi in Italian-ruled Libya was occupied by British forces. Italian inhabitants of Benghazi work to resist the British and discover their military plans. One man, Captain Enrico Berti, appears to be collaborating with the British but is in fact working undercover for Italian intelligence. The film ends with the city being recaptured by Italian troops and their Nazi German allies.
| Actor | Role |
|---|---|
 Fosco GiachettiHauptmann Enrico Berti / Il capitano Enrico Berti | Hauptmann Enrico Berti / Il capitano Enrico Berti |
 Maria von TasnadyCarla Berti | Carla Berti |
 Amedeo NazzariFilippo Colleoni | Filippo Colleoni |
 Vivi GioiVivi Gioi | Vivi Gioi |
 Guido NotariBürgermeister / Il podestà italiano a Bengasi | Bürgermeister / Il podestà italiano a Bengasi |
| LLeo GaravagliaDr. Malpini | Dr. Malpini |
| LLaura RediFanny / Maria detta 'Fanny' | Fanny / Maria detta 'Fanny' |
 Fedele GentileAntonio | Antonio |
| AAmelia BissiMutter / La madre di Giovanni | Mutter / La madre di Giovanni |
 Carlo DuseHauptmann Marchi / Il capitano Marchi | Hauptmann Marchi / Il capitano Marchi |
 Piero HeliczerSandrino Berti (Pucci) | Sandrino Berti (Pucci) |