Paarthal Pasu is a 1988 Indian Tamil-language mystery thriller film, written and directed by K. S. Gopalakrishnan.

[2] Shankar, a lawyer, gets entangled in a complex case involving deceit and murder when his fiancée, Ratna, a policewoman, learns about an illicit operation where a police officer is involved in helping a criminal run a brothel.

Determined to bring the corrupt officer to justice, Ratna enlists the help of her fiancé, Shankar.

Together, they navigate through a dangerous web of crime and corruption to expose the truth and seek justice.

[3] The Indian Express wrote that the film "means to exploit audience's weaknesses to the hilt".