In 1986, In Brooklyn, New York, the dysfunctional family of pseudo intellectuals composed by the university professor Bernard (Jeff Daniels) and the prominent writer Joan split. Bernard is a selfish, cheap and jealous decadent writer that rationalizes every attitude in his family and life and does not accept "philistines" - people that do not read books or watch movies, while the unfaithful Joan is growing as a writer and has no problems with "philistines". Their sons, the teenager Walt and the boy Frank, feel the separation and take side: Walt (Jesse Eisenberg) stays with Bernard, and Frank with Joan, and both are affected with abnormal behaviors. Frank drinks booze and smears with sperm the books in the library and a locker in the dress room of his school. The messed-up and insecure Walt uses Roger Water's song "Hey You" in a festival as if it was of his own, and breaks with his girlfriend Sophie. Meanwhile Joan has an affair with Frank's tennis teacher Ivan and Bernard with his student Lili.