The movie is about a love triangle of 3 childhood friends, Sunder(Raj Kapoor), Radha (Vyajayantimala ) and Gopal (Rajendra Kumar). Sunder loves Radha and is really obsessive about her. But Radha is in love with Gopal, who also loves her but never discloses his feelings for her. Sunder confesses his feelings for Radha to Gopal & Gopal decides to sacrifice his love. As Sunder is leaving for a military mission to Kashmir, he takes a promise from Gopal to take care of Radha & asks him to never let a man come between Radha & himself. After few day Radha & Gopal get news that Sunder is shot down & dead. Radha & Gopal then confess their love for one another & plan for their marriage. Sunder makes a re-entry. Gopal again sacrifices & convinces Radha to marry Sunder. Finally Sunder & Radha get married. Radha decides to forget Gopal & stay faithful to her husband. But their married life gets shattered when Sunder finds a love letter written by Gopal to Radha. The story takes a very dramatic turn, when all these three people come face to face.