Thira is a dramatic thriller movie, and the other parts will be following the fist one. Yesteryear actress shobana is doing the main character in this film. Vineeth Sreenivasan introducing his brother Dyan sreenivasan through this film.
The other main characters are from outside kerala. The shooting of the film is taking place at karnataka and goa.Thira starts when Doctor Rohini (Shobhana) who runs a NGO who works against traffic of girls and sex racketing loses her husband, which involves conspiracies and mysteries. The girls who were being protected by Rohini, are kidnapped.
Parallel to this Naveen (Dhyan Sreenivasan), who came to city to meet his sister, witnesses her being kidnapped by a group of people. Now begins the battles of both the lead characters and soon the meet to realize that there mission is the same.