Raja (Metro Shirish), a police constable, falls in love with Ranguski (Chandini Tamilarasan), and gets her to accept his love by posing as a stalker over phone. His ploy succeeds, but he gets the shock of his life when he starts getting calls from a mysterious person mimicking his own voice! The caller threatens to take Ranguski’s life, and Raja, who goes to her residential colony to protect her, ends up as the prime suspect in the murder of her neighbour, Maria Paulraj (Anupama), an antique collector. KK, the senior officer deals the case. How did Raja escape from the case?
Shirish chooses unique roles, he should improvise his expressions. Chandini has nothing big to do. The supporting stars had done their part well. Yuvan Shankar Raja’s music is a gift to the film. Despite the hastily written scenes that set up the romance between Raja and Ranguski, Dharanidharan manages to give us a fairly gripping murder mystery in the first half of Raja Ranguski.