It is an average day at the office for the employees of the company Belko. That is, until a mysterious, unknown voice takes over the intercom system, calmly instructing them that they must kill three of their fellow colleagues or six others will die — and any disobedience from these rules will have deadly consequences.
Disbelieving at first, the group quickly comes to realize the announcement is not a joke. The employees are forced into a twisted social experiment, held hostage in their high-rise corporate office in Bogotá, Colombia. As tensions mount and the stakes grow higher, the employees must find a way out of this deadly game of kill or be killed.