The International Tracing Service (ITS) in Arolsen, Germany, was set up in 1943 in London to collect information on civilian victims of the Nazi regime. Half a century later, the ITS is in possession of 44 million documents and is still updating its files and replying to enquiries. The story of the ITS (administered by the ICRC since 1955) is told through the personal accounts of four survivors who speak of their harrowing experience in the camps and explain how the ITS was able to help them.