Chitkabrey (2011)

Lured by one of their victims, held against their wills in a mansion by armed guards, former students of Bangalore's PV College of Engineering in the company of their respective spouses, reflect on their past lives, and extra-marital affairs. Their captor, Rakesh Choubey, a former student of the same institute, the only child of a widowed Class 4 Railway employee, was mercilessly ragged and humiliated by them, leaving him with psychological scars that never healed. He taunts them, gets them to openly confess and apologize, and goes about to list the terms of their release. He stipulates that if the conditions are not met within 24 hours - all of them will die violent deaths.