Compliance (2012)

At a fast food restaurant, the manager, Sandra, is having a bad day. Suddenly, she gets a phone call from a man claiming to be a police officer who has a complaint that one of her young female employees has stolen from a customer. At the orders of this authoritative sounding stranger, Sandra takes the apparent accused, Becky, to a back room to search her before she is picked up. Once there, the phone scammer manipulates the gullible personnel into participating in Becky's sexual humiliation that grows more twisted with every new sucker on the phone. Only when one final person has the conscience to revolt do they realize the crime they were tricked into, which the real police are hard pressed to solve.