Vijayakanth, an honest C.I.D. inspector, is married to Seetha and they have a daughter Shamili. Vijayakanth has enough evidence to arrest a dangerous criminal Tiger Kaali. Vijayakanth befriends Rekha, a C.I.D inspector, without knowing that she is Seetha's friend. Seetha compels Rekha to live with them. Seetha has blood cancer but she conceals this from her husband. When her husband and her friend know this news, they decide to go to the United States for treatment but Kaali manages to kill Seetha and erases the proofs. Vijayakanth is now more determined to catch him.
Rajanadai was released on 28 October 1989, alongside another Vijayakanth starrer Dharmam Vellum.[5] P. S. S. of Kalki wrote that on one hand, there was a desire to express the sentiment of affection for wife, child and family, and on the other hand, there was a desire to take revenge on anti-social forces; director Chandrasekhar tried to bind the fans by separating the two, and the rope was not strong.[6]
^பி. எஸ். எஸ். (10 December 1989). "ராஜ நடை". Kalki (in Tamil). p. 38. Archived from the original on 30 April 2023. Retrieved 30 April 2023 – via Internet Archive.