At exactly 12:00 noon, two gunshots are fired at the Dadar Railway Station, Bombay. The gunshots kill Maya (Sabita Chatterji), the wife of Raimohan (Rehman). One of the assailants is none other than Maya’s sister, Bani Choudhary (Waheeda Rehman), and a gun is recovered from her handbag. The second assailant flees on a motorcycle, meets with an accident, and is instantly killed. The police charge Bani with murdering her sister. Faced with overwhelming evidence against Bani, her lawyer boyfriend, Ajay Kumar (Guru Dutt) must race against time to come to the truth behind Maya’s murder.