抗日战争期间，国民党某连长董子铭奉命押送一批抗战军火到南京，军火安全抵达目的地，董子铭被上司授予了一枚“青天白日”勋章。然而当他得知历经艰辛运送的并非军火而是走私品时，为了证实自己的清白，他开始了调查。真相大白之际，董子铭面临着一场命运的抉择······

During the period of China’s Resistance War Against Japanese Aggression, a company commander of Kuomintang, Dong Ziming escorts the weapons used in the war to Nanjing by order. With the weapons safely arriving at the destination, Dong Ziming is granted by his superior a medal “Order of Blue Sky and White Sun with Grand Cordon”. However, knowing that what he escorts with great hardship is not weapons but contraband, he starts to investigate the case to prove his innocence. When the whole thing comes to light, Dong Ziming has to make a choice between life and death…