Thalathil Dineshan (Sreenivasan) is a man who runs a printing press. He is burdened with insecurities about his lack of height and dark complexion. His life spirals out of control after his marriage to Shobha (Parvathy). His insecurities are heightened by the fact that his wife is exceptionally beautiful and is taller than him. Initially he is overprotective of his wife, which worsens his relationship with his brother Prakashan(Baiju). He feels challenged by the charm and wit of his brother, which eventually leads to the eruption of a feud in the family. Dineshan gradually resorts to tactics which, he feels, will enable him to earn the respect and admiration of Shobha. He finds a new confidante in Thalakulam Sir (Innocent), who gives him immature advices to win the heart of his wife Shobha. He starts drinking, believing that it is a symbol of machismo. He memorizes jokes from a weekly magazine and monotonously delivers them to his wife, so as to appear witty. But all these attempts turn out to be pure antics and he makes a fool of himself. Shobha, an archetypal Indian wife, is very much devoted to her husband and cannot understand Dineshan's eccentric behaviour. He gradually becomes paranoid and starts suspecting his wife. He threatens the brother (Lalu Alex) of Shobha's friend, whom he suspects of having an affair with her. Things spin out of his control when Shobha learns everything. He is even confined to a mental hospital following some incidents resulting from extreme paranoia, and after a brief treatment he appears to be a changed man. Dineshan wins his wife back from her parental home, assuring her of love and care. Now all seem to be fine with them, but again in the dead of the night when his wife is asleep he starts looking out suspiciously in his backyard for his wife's "secret lover", almost like a Hitchcock ending. Thus Dineshan lives up to the title of the movie, "Vadakkunokkiyanthram" (compass) and like a compass, whichever way his life turns, he remains oriented towards his inferiority complex and suspicion.