ബ്ലാക്ക് ഡാലിയ

A string of mysterious murders happen in an aristocratic mansion. The owners of the mansion seek CBI officer Sethurama Iyer's help to find the person responsible for the deaths.

An unknown pregnant girl has ended her life by hanging herself from ceiling fan in a room of a little known hutment of Mumbai. In middle of the night, an uninvited Inspector lands in the house of an eminent Industrialist to investigate the case. Baffled by suggestion of being linked with the incident and shocked by the thought of being responsible for death of a person surviving at the outermost fringe of their vision of society, Vikrant Pradhan and his family give in to the interrogation reluctantly.

Appu is a taxi driver in Mumbai (Bombay). He is still haunted by the suicide of his sister who was sold to a brothel. He is still trying to find out the culprit. Here he meets Sita who is chased by Eunuch Maharani who is also responsible for the death of his sister. Maharani is the madame or kingpin of the flesh trade in Mumbai. Maharani wants the beautiful Sita for the flesh trade. Appu fights and saves Sita from Maharani. Here his friend Vignesh and his lover Kaveri die saving Appu and Sita.

A journalist is illegally jailed for exposing two corrupt politicians, He exacts revenge through his new mysterious newspaper.

Alexander is a powerful underworld don but in reality, he is Vinu, the son of the current Inspector-General of Police, Balakrishnan (Madhu). Balakrishnan is torn between his duty as a police officer and as a father. Alexander too has the same dilemma: he has a son of his own as well.

A renowned actress, Aswathi, is murdered. When a CBI officer, Sethurama Iyer, investigates the case, he unravels a dark secret about Aswathi which brings forth several complexities.

Alex, who is awaiting execution, confesses to having committed six out of the seven murders he is acquitted for. Officer Sethurama Iyer decides to trace the original murderer of the seventh one.