《R4之谜》是由李安棣执导，张力维,乔榛主演的剧情片。该电影于1982年在大陆上映。陈小小因“逼人致死”罪被判刑20年。女公安李安了解到自己的未婚夫路沙正是陈小小之前的恋人，并在谈话中发现陈小小案件疑点太多。经过许多次心理斗争，李安决定替情敌翻案。可心灰意冷的不小不愿意配合李安，无奈的李安只好牺牲爱情。在路沙的鼓励下，小小终于说出实情，原来幕后的黑手竟是小小的老师、路沙的舅舅亦秋。7年前，亦秋研制杀人药被小小发现，他害死张秀秀嫁祸小小。在看破中，还查出亦秋的后台，路沙的上司冯科长。小小出狱的，看着昔日的恋人在一起，李安默默地离开了。
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