Michael Portillo investigates what makes ordinary people commit acts of violence. He investigates the darker side of human nature, himself being driven to the edge of violence in an extreme sleep deprivation study. He meets men for whom violence has become an addiction and watches a replication of one of the most controversial studies in history, the Milgram study. Will study participants be willing to administer a seemingly lethal electric shock to someone they think is an innocent bystander?
