The Translation of Love, Lynne Kutsukake

Twelve-year-old Fumi Tanaka has a problem – her beautiful and beloved older sister, Sumiko, has disappeared. Determined to find her, Fumi enlists the help of her new classmate Aya, forcibly repatriated with her father from Canada after the war. Together, they write to MacArthur and deliver their letter into the reluctant hands of Corporal Matt Matsumoto, a Japanese-American GI whose job it is to translate the endless letters. When weeks pass and they hear nothing from Matt, the girls take matters into their own hands, venturing into the dark and dangerous world of the black market and dancehalls. They're unaware that their teacher, Kondo Sensei, moonlights as a translator of love letters, and that he holds the key to Sumiko's safe return.