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　　Luna, a cruise ship chambermaid, has to quit her job to attend to her sick brother. While doing so, she discovers that her mother has gone missing and her brother's condition is getting progressively worse. The siblings desperately sneak into an empty condo unit but soon discover that Penthouse 77 is not what it seems.

 1940年，北满抗联独立大队屡遭日军追袭，被迫在深山老林中不断转移，对外联系也已被日军切断。地下党龙泽群获知日军间谍独狼已潜入独立大队，一场惊心动魄的锄奸行动就此展开……该片展现了北满地区社会各界人士团结一致，反抗侵略的伟大精神。