Lighthouse)[1] is a 1965 Indian Tamil-language action thriller film directed by K. Shankar, starring M. G. Ramachandran and B. Saroja Devi.

Ravi, a leading lawyer, travels to Mahabalipuram to meet his doctor friend Gopal.

Ravi intervenes on time and saves the girl but astonished when she blabbers about names of ancient Tamil Pallava king Narasimhavarman I and calls herself as Sivagami (character from the historical novel Sivagamiyin Sapatham), and she wants to commit suicide because her lover King Narasimha Pallava left her.

Ravi continues his drama as King Narasimha Pallava, Sivagami's (i.e. Neela's) lover.

Gowri unwillingly supports Nagarajan as he promises to marry her when his mission is successfully accomplished.

Neela gets back her memories, and she shows signs of recovery from her mental illness, which shocks Nagarajan.

One day when lovers were spending time, Nagarajan interrupts and kidnaps Neela away, and he replaces Malliga in her place.

One night, Malliga tricks Ravi and Gopal and brings them to the lighthouse as per instruction by Nagarajan.

Not still convinced by the reply, Ravi peeps into Malliga's room and shocked to see the injury at her back side which he mistakes that she is Neela, and she is acting.

Gopal and Ravi make multiple attempts to find out what happened on the fateful day, but in vain.

Gowri makes Malliga promise that she won't reveal anything about the fateful day to her husband, or else Nagarajan will kill Ravi.

Ravi confuses Malliga by acting like an insane who is still unable to come out of the trauma of his lover's death.