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Three young programmers come across an abandoned technology meant to detect supernatural presence. They reverse engineer the tech and create an app for their phones which allows them to see ghosts, thus endangering their own lives.。该片讲述了在民国时期发生在天津的一起案件，因官员的贪污腐败，掩盖真相导致案件黑白颠倒，凶手逍遥法外，亡者冤情始终没有昭雪。新中国成立后，人民法院重审此案才得以真相大白，凶手认罪伏法，正义终将战胜邪恶。。