It stars Prithviraj Sukumaran, Catherine Tresa, Siddique, Lalu Alex, Prajin, Mallika Kapoor, and Sampath Raj in pivotal roles.

DCP Niranjan, a furious police officer, is assigned to investigate the murder case of prominent banker Simon Palathungal (based on Paul Muthoot), which formed the headlines in the Kerala media for more than three months.

Through this investigation, Niranjan finds out that a big crime racket is behind Simon's murder.

The rest of the film shows how Niranjan tries to bring the real culprit of the murder case.

[1] The first schedule of The Thriller takes place in and around Thiruvananthapuram, Kovalam, and Vizhinjam.