本片讲述了一位受过良好教育的年轻人梅尔特的故事，他仪表堂堂，事业有成。他在纽约和伦敦居住了几年之后，决定回到伊斯坦布尔，和他的母亲一起生活。一天，他参加了朋友为庆祝他回来而举办的出海巡游，在旅途中，梅尔特遇到了一位很有活力的年轻女士，他的生活就此发生了改变……

"Not knowing" focuses on the life of a family that is not satisfied with their lives. Selma and Sinan are a couple who now find it difficult to endure each other. Umut, the son of the house, is after to prove himself. At the end of high school, rumors start circulating about Umut, who is homosexual. While Selma and Sinan are trying to cope with their tiring marriage, Umut suddenly disappears when the rumors go away and his head disappears. While Selma and Sinan are looking for their son, he realizes that they have actually lost themselves.