Vallavanukku Vallavan (1965)

Asokan is an engineer who is need for money to start his project. He meets Manimala father who is much satisfied with his project and hence offers him money. One day, his suitcase coincidentally swaps with Manorama whose gang has robbed a bank. Asokan is caught and eventually sentenced. The gang sends Manohar, a local rowdy to kill Asokan so that he doesn't identify Manorama. But Manohar takes him captive and demands for more money from the gang. Asokan manages to escape from Manohar and fake his death by committing suicide from a waterfall presuming his death would bring out the robbery gang. All these incidents is been secretly followed by Gemini Ganesan who introduces himself to be a policeman to Asokan and is aware that he is innocent. In the end it is revealed that Gemini Ganesan is actually the head of the robbery gang and Manohar is a vigilant police officer. He has disguised himself to be a rowdy so as to catch the criminals behind the robbery.