Helga Weiss, a Czech Jewish girl, was sent with her parents to the concentration camp at Terezin, a few days after her 12th birthday in 1941. She kept a diary, in words and pictures, and when she and her mother were sent on to Auschwitz in 1944, her uncle hid the diary in a brick wall for safekeeping. These are some of the pictures from her diary, which has only now been published