电影取材于南京大屠杀期间日军真实罪证影像，1937年南京大屠杀，邮差阿昌（刘昊然饰）为了保命，冒充相馆冲洗工，为日军冲洗照片，并收留了一众中国军民，使相馆成为临时的庇护所。但面对日军残酷暴行，阿昌冒着生命危险将避难者们安全转移，并将屠杀罪证公之于众 。
The story is based on real documented evidence of the atrocities committed by the Japanese army during the Nanjing Massacre. A group of civilians hiding in the Lucky Photo Studio to escape the violence are forced to assist a Japanese military photographer in developing film to survive each day. By chance, they develop photographic evidence that exposes the Japanese army's massacre in the city. Initially focused only on surviving the horrors, they ultimately decide to preserve these damning negatives as proof of the atrocities unfolding in Nanjing.
Nankin, lata 30. XX wieku. Listonosz Chang pracuje w studiu fotograficznym, wywołując zdjęcia dla japońskiej armii. Tym sposobem odkrywa dowody popełnionej przez nią masakry.
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