There are two mischievous student's groups in a college in the city of Mumbai. One is Mobile and other one is Rampuri group. Mobile group is expert in ragging, while Rampuri is spreading terror with knives. In the same college Ravi is also studying and is very much oppose to ragging. College principal Mr. Dhawan is also against ragging because he had to resign in his previous college for the same reason. Alok, a simple and innocent student takes admission in this college. Mobile group is ragging in the laboratory and as a result fire takes place in which Alok dies.
Recollecting the similar incident in his previous college, principal tries to hush-up Alok's death as an accident. Mobile group feels guilty for Alok's death and ask pardon from Ravi. Ravi falls in love with Suman in the same group. John and Rana from Rampuri group become jealous about this and try to rape her but could not succeed. Consequently, they were rusticated from the college. Rana's politician father threatens principal for rusticating his son from the college. Rana and John plans to teach a lesson to Mobile group. In the meantime, a girl with suspense character, Sonia who knows secret of all students takes admission in the same college. Subsequently a girl and a boy were murdered from the mobile group. At the place of incident, police finds cigarette butts similar to what late Alok use to do while smoking. Mobile group suspects some link between Alok and this incident. Also, they come to know that Sonia is Alok's sister and she knows all their secrets through the diary maintained by late Alok. They started doubting at Sonia. As a security measure, Mobile group gets police protection. Inspector Choudhary starts investigation on this matter. At the same time one more pair of mobile group was murdered. Now, suspicion falls on Rampuri group. Police arrest Rana from Rampuri group and he confesses that he has murdered Alok. Now, people find relief. However this relief is short-lived and murders go on in the campus.
Is Ravi whose sister was ragged and consequently committed suicide, the culprit? Is Rana's politician father behind this murder? Is late Alok's sister Sonia is responsible? Is Inspector Choudhary under whose protection is the Mobile group a culprit? Is Suman's father or Principal of the college is involved in this episode? To clear this suspense, watch "APRADHI KAUN".
(From the official press booklet)