2007年，美国内华达州。24岁的年轻摄影师雅尼夫·舒尔曼（雅尼夫·舒尔曼YanivSchulman饰）收到了一幅根据他摄影作品绘制而成的画作。欣喜之余，他惊讶地发现这幅画作居然出自一名八岁的小女孩麦乐迪·罗雪尔（麦乐迪·罗雪尔MelodyC.Roscher饰）之手。雅尼夫立刻在Facebook上与这位才华洋溢的小女孩结成了好朋友。通过麦乐迪，雅尼夫开始了解她的家庭，更与她的姐姐梅根·法契欧（梅根·法契欧MeganFauuyuuyio饰）展开了一段浪漫的异地恋。雅尼夫的哥哥艾瑞儿·舒勒曼（艾瑞儿·舒勒曼ArielSchulman饰）决定与他的好友亨利·乔斯特（亨利·乔斯特HenryJoost饰）将这段恋情经历拍成纪录片。然而一连串隐藏在网络背后令人毛骨悚然的谎言，渐渐浮出水面，令人不寒而栗。由新人导演亨利·乔斯特携手艾瑞儿·舒勒曼执导的一鸣惊人之作《鲶鱼》，以纪录片的形式，呈现出了一段交织在爱情与家庭伦理间的生活启示录。
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