Millions of people live behind bars. Whatever the reason for their imprisonment, they have the right to be held in humane conditions, free from ill-treatment and torture. The ICRC has been working in places of detention since 1915, today visiting 500,000 detainees in some 80 countries every year. This film offers a unique insight into how we work, exploring our relations with prison authorities and the importance of confidential interviews with the detainees.