The movie opens to show how fearless and bold sub-inspector Kathiresan (Kathir) is. Unafraid of anybody and wanting to stand up for the right, Kathir is ready to face any situation. In a scenario where a ruthless, young gang kidnaps a rich man's child and kills another poor man's child just to make a statement, Kathir takes a stand. He follows the gang's ransom instructions to the letter, except that he tracks their whereabouts and while rescuing the kid, has to shoot down one of the gang members. The rest of the gang members, lead by Prabhakaran (Laguparan) are enraged and vow to take venomous revenge on Kathir by taking out his family. Watch Sathru (Foe) to know what happens next...
Director Naveen Nanjundan has gotten together a very gripping plot with plenty of twists and turns and thrilling cat & mouse chases. The first half moves rather slowly, while trying to build up the characters. However, the second half is far more racy and takes the narrative forward quickly. There are a number of characters, some of whom lend weightage to the story while some have no reason to be anywhere close to it. Kathir, who has been impressing us with powerful performances in all his movies so far, seems to have fallen prey to Murphy's Law. His physique and attitude perfectly fit his cop role but there are places where he seems to be overacting. Srushti Dange as Darshini, who is supposedly the female lead, has nothing to do in the movie. She has no scene of note, except for a fake drunken dance for a classic song, for a couple of seconds in the beginning of the movie.
Laguparan is the saving grace and has performed his character with a calm maturity and intensity. However, even he seems to be pulled into the tardiness of the overall movie, at times... However, it is very thankfully, only at times! The young guys who play gangsters are all very impressive and have acted well. Suja Varunee as Kasthuri, is good in what little she has to do. She aces her few scenes and has played a rugged character with negative shades. A veteran like Ponvannan and a talented performer like Pawan have been wasted. Naveen Nanjundan, who has also written the story, screenplay and dialogues, has faltered big time in the screenplay, direction and dialogues department, despite doing a very good job with the story. The first half seems to be heavily inspired by Naan Mahaan Alla and one can find quite a number of similar or inspired scenes. Suryaprasad's background music is jarring and at times goes to the level of giving sensitive ears, a splitting headache.
The biggest downside for this movie or to put it more on the same level - The biggest Sathru (foe) for this movie is the lack of logic! The movie seems to just be rushing off on random shots here and there. Logic seems to be lacking in almost all sequences. This tends to break continuity and we are left wondering how the previous scene and the current scene end up getting connected. The first half is riddled with unwanted build-up scenes and chaotic shouting. Just as the second half begins to get interesting, quite a number of unwanted scenes like the tea-shop scene to give build-up for a small boy are dead-weights for the movie. Crisper editing would have helped the movie better. One of the biggest plus points of Sathru is the stunt choreography, which has been handled by Vicky. Sathru, with a U/A certificate and a run time of 129 minutes, is produced by R.T. Infinity Entertainment and released worldwide by Milestone Movies.