In the last episode of his monumental BBC series, Civilisations, Simon Schama, asks, 'What can Art do when horror comes calling?' In attempting to answer that question, he looks at the art made in Theresienstadt, the model village that acted as a front to hide the horrors of the Nazi concentration camps, views the work of modernists such as Piet Mondrian and Jackson Pollock and interviews and investigates the profoundly moving work of more contemporary artists such as Anselm