Izawa Kazuo has a good life running a simple photography store in London... until he's suddenly arrested under suspicion of espionage. As Isawa undergoes a harsh interrogation, 
Lieutenant colonel Howard Marks, master spy for the British Secret Intelligence Service, appears before him.
A Japanese Imperial Army codebook.
.كتاب تشفير للجيش الإمبراطوريّ اليابانيّ
Ein Codebuch der japanischen
kaiserlichen Armee.
Un libro de códigos del Ejército Imperial.
Un libro de códigos del Ejército Imperial.
Le livre des codes secrets
de l’armée impériale japonaise.
Un cifrario dell'Esercito Imperiale Giapponese.
O manual de códigos 
 do Exército Imperial Japonês.