Suman (Raakhee) and Amit (Amitabh Bachchan) love each other and plan to marry soon. Amit lives with his younger brother, Raju (Randhir Kapoor), and Raju already calls Suman "Bhabhi". Amit is a teacher in a college, but Raju is unemployed and a little bit spoiled by Amit and Suman's pamperings.
Neetu Singh has a small role as Raju's fiancée. Raju gets into bad company, and as a result, lands in trouble. When Amit comes to help Raju, he is killed. Suman dons the garb of a widow and plans not to marry again.
Then one day a look-alike of Amit, named Shankar enters Suman and Raju's life. Guilt-ridden, Raju thinks that he has gotten his brother back, and tries to make amends by hiring Shankar, not knowing that Shankar is a wanted criminal, and is looking for an escape route from the authorities. Suman and Raju's affection eventually wins Shankar over from his past evil ways. Shankar cannot escape his past though. Suman is kidnapped and Shankar forced to help kingpin to smuggle diamonds by using an international car rally championship as cover. With Raju's help, good prevails over evil.