Idhayakkani is a 1975 Indian Tamil-language action thriller film directed by A. Jagannathan and produced by R. M. Veerappan. The film stars M. G. Ramachandran in the lead role as Mohan, a kind-hearted man who implements his theory of life "equality" by sharing equally the income of his estate with his labourers.
Mohan joins the police force to serve his country and meets a needy girl, Lakshmi, whom he takes into his home. He decides to marry her, but their happiness is short-lived when he learns she may be involved in the murder of a prominent scientist. The film follows Mohan's investigation as a police officer to uncover the truth behind the crime.
The movie explores themes of idealism versus harsh reality through its protagonist's journey in the police force. It also delves into personal and professional challenges as Mohan navigates his marriage and the murder mystery, seeking to find out what actually happened.