It has an ensemble cast including Gemini Ganesan, Thangavelu, Manohar, Ashokan, Ramadas, Manimala and Manorama.

Ramesh is an engineer who is hunting for a job and, with the help of his friend Babu, goes to see a wealthy businessman named Laxman for a new project of his.

Pichua also angers the criminal gang of Mala, when he asks for a greater sum in return for killing Ramesh.

Geeta, believing his death to be real, comes to the waterfall, where he supposedly committed suicide and learns that he is not really dead.

After this, the mysterious man (Gemini Ganesan) appears secretly inside Ramesh's car, promising to help him.

Men from the criminal gang disguised as policemen and "arrest" Ramesh, whom they intend to murder at a safe spot.

When the mysterious man tries to act his police disguise there, Pichua reveals he is Mr. Prakash, the true leader of the crime gang, and he himself is Inspector Sekar of Vigilance Branch.

After some talk, an elaborate fight and chase, Mr. Prakash drives a boat that crashes into a rock, killing him.

The film ends with Babu receiving a prize sum from the Police Department for his help in the case.

Vallavanukku Vallavan is a remake of the Hindi film Ustadon Ke Ustad,[1] and the 100th production of Modern Theatres.

[4] The song "Manam Ennum" is based on "Sau Saal Pehle" from the 1961 Hindi film Jab Pyar Kisi Se Hota Hai,[5] and "Or Aayiram Paarvaiyile" is based on "Sou Bar Janam Lenge" from Ustadon Ke Ustad.