Chemistry is a 2009 Malayalam film by Viji Thampi based on a true story about a high school student. The film was later dubbed into Tamil as Naan Gowri in 2012.
Fed up with Parvatis maniacal episodes due to possession, Sreekanth calls doctors but they are not able to help much. Finally he calls a Tantrik who casts ParvatiGowri under a spell and makes her tell all that is going on. It is then revealed that the music teacher is a womanizer and he actually tried to rape Gowri at the picnic. It is also shown that he has taken nude pictures of the girls, and threatened to reveal them to everyone if they did not give in to his desires. Jennifer had been hand in glove with Aloyshi. The panic stricken girls then committed suicide in the school, but as Gowri did not die immediately, Aloyshi and Jennifer arrived early at the scene in the school and gave her more poison to hasten her death. Thus, Gowri returned for revenge, through Parvati.Aloyshi is now arrested by cops but he manages to get bail. Gowris father attacks him on the way but Aloyshi throws him into the river and escapes. Gowri Parvati goes to Aloyshis house one night and throws him from the terrace, thus killing him. Sreekanth arrives too late, and returns home to find that Parvati had never gone out of the house that night ........
Source: Wikipedia