S. V. Ramadas

Ravichandran and Kanchana meet and fall in love. Kanchana visits her uncle Asokan's house during her holidays with her friends. There the murder spree starts. Kanchana's aunt gets saved from a murder attempt but later she also becomes a victim. An eerie atmosphere hovers around the house. Ravichandran also attempts to trace the murderer. Tracing the culprit and his motive is the rest of the film.

Rangadurai (Sivaji Ganesan) borrows money from (Somasundaram) M.N.Nambiar to sustain his theatre group during a financial crunch. Enmity arises between the two when Rangadurai marries Somasundaram's daughter against his wishes.

Ave Kallu is the story of hunt of a serial killer. Susi (Kanchana) comes home to realize that her family members are being murdered one after the other. A half-smoked cigarette at every murder scene is her only clue. Bhaskar (Krishna) who is in love with Susi investigates the murder mystery and identifies the killer which leaves everyone in a state of shock.